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# Information files

## Multimedia

A&A can also publish multimedia and 3D models embedded within HTML and PDF versions of articles: these are displayed alongside the article’s text.

## Movies

### Size

When you submit your video files, please make sure their size is appropriate: as small as possible (and not larger than 10 Mb) but still big enough for all the important scientific information and details to be clearly visible. We will not resize videos, so authors are expected to submit their video files in the size and format in which they wish them to appear.

### Format

We accept .mov, .avi, .mpg and .mp4 files. Please note that we cannot accept movie files that require the reader to download particular codecs; files must be playable on standard media players such as QuickTime, Windows Media Player or VLC.

### Examples

Movies can be either fully embedded in the text, or linked to.

• The "media9" package provides an interface to embed 3D objects (Adobe U3D & PRC), as well as video and sound files or streams in the popular MP4, FLV and MP3 formats, into PDF documents with Acrobat-9/X compatibility. See for example the following article:
http://www.aanda.org/articles/aa/full_html/2013/03/aa20646-12/aa20646-12.html
Figures 2 and 6 are fully embedded in the HTML and PDF versions with the LaTeX package "media9".
• If you do not choose to embed your movies within your article PDF and HTML files, you can also refer to them in your text/figure caption(s) at appropriate places, and we will add a direct hyperlink to the webpage hosting your videos on our website. The video can either be referred to within a sentence, e.g.:
"Fig. 2. Same as Fig. 1 for the sequence running from 2 January 2005 13:36:19 UT to 8 January 2005, 15:00:10 UT. The temporal evolution is available as an online movie." Or, it can be just mentioned within parentheses, e.g.:
"Fig. 2. Evolution of the jet in 171 Å […] Bottom right: elongated jet structure with over-plotted cross-cuts used for anlaysis of the kink motion (Online movie)." Here is an example of a hyperlink between a PDF version of an article and the webpage hosting the corresponding videos:
http://www.aanda.org/articles/aa/olm/2014/01/aa21213-13/aa21213-13.html
• If your video is not attached to a figure (e.g. graph, image, etc), then please remember to supply a snapshot of the video and a caption for us to use as an illustration in the PDF version of your article.

The names of your files should make it easy and quick for the typesetter to know which figure/video it is and to distinguish between video files and alternative PDF files. An example is given below:
aa22345-fig1.jpg
aa22345-fig1_movie.mpeg

## 3D models

### Size

When you submit your 3D model files, please make sure their size is appropriate: as small as possible but still big enough for all the important scientific information and details to be clearly visible. We will not resize your files, so authors are expected to submit their video files in the size and format they wish them to appear.

### Formats

U3D or PRC files may be embedded directly into the PDF with the "media9" package. See for example figure 15 in the PDF file of the following article: http://www.aanda.org/articles/aa/abs/2014/01/aa22032-13/aa22032-13.html.

The size of the whole PDF document should not exceed 50 Mb. The same requirements as for videos apply, and your files should have easily identifiable names.

At present time, the technical tools to automatically standardise the process of including a 3D object into an HTML format do not exist. To overcome this technical limitation, A&A will accept links to 3D models on your site or on any specialised site such as Sketchfab. In this case, links should be included in your article as footnotes at the appropriate places.

## Including author names using non-Roman alphabets

A&A authors have the possibility of including names in their native alphabets in addition to their English names. These names will be in parentheses after the English names displayed in the PDF. It is the responsibility of the authors to check the accuracy and formatting of their names in the final proofs that they receive prior to publication.

## “native-names” Files

After your paper has been accepted, you will be asked to send all your files to the publisher. If you want to include names in non-Roman alphabets, it is also necessary to send the publisher the full list of authors in a file named “native-names”. Then names should be in the same order as in the accepted version of your manuscript, but adding any needed non-Roman names

## How to generate this file?

Please use an appropriate Unicode text editor to save the list of the names in UTF8:

Example of a “native-names.txt” file
John Smith
Georgi S. Golitsyne Георгий Сергеевич Голицын
Beihong Xu 徐悲鸿
Nikos Khatzikyriakos-Ghikas Νίκος Χατζηκυριάκος–Γκίκας

You may also send the publisher a Microsoft Word or Open Office file with standard fonts: native-names.docx, native-names.odt.

## LaTeX files

In addition to this file, authors may wish to enter their native names in the LaTeX file and the PDF file. Authors that are used to entering specific characters/fonts and to working with specific packages may send their LaTeX/PDF files with their native names:

 \author{John Smith \and Georgi S. Golitsyne (Георгий Сергеевич Голицын) \and Beihong Xu (徐悲鸿) \and Nikos Khatzikyriakos-Ghikas (Νίκος Χατζηκυριάκος–Γκίκας)} 

These files will be the ones used by the production office, but make certain that you also send the native-names.txt, .docx, .doc, or .odt file (see above).

## Some frequent corrections

These are several other words and phrases that we need to deal with regularly, because they are either vague, informal (I), or simply not correct (x). More examples of redundant or wordy formulations (R) are also listed with a possible correction.

 The phrase to question Error? The correction or suggested changes Those related to the use of a pronoun (multi-word verbs and expressions) To depend of/dependent of x To depend on/dependent on Independent on x Independent of Evidenced by x Shown by Evidence for Evidence of (the main choice of preposition) Comparable with x Comparable to Useful to determine A tool to determine Useful for determining A tool for determining Typical for x Typical of Impossibility to do X Impossibility of doing, but It is impossible to do To allow/enable/permit to do x Transitive verbs require a direct object, so: To allow/enable someone to do something Suited for x Suited to (for most contexts) Originate from R Originate in Penetrates in/into X x, R Penetrates X Dominates over X x Dominates X We detail X I We explain in detail, We describe, etc. We describe in detail X ... in details ... x x We describe X in detail ... in detail ... Take into account something Take something into account (a separable multi-word phrase meaning "to consider") Of order x Either (i) "on the order of" (US) or "of the order of" (UK) to mean "approximately" or else (ii) within an order of magnitude In case of In the case of (meaning, in this example here, not "In case" which means "if") In a timescale / Of a timescale x On a timescale of ... Variation of/in To vary by OF indicates the amount of variation while IN indicates what is varying, not by how much: "a variation in amplitude of 5%"; the verb use: "The amplitude varies by 5%" Associated to Associated with Adjacent with x Adjacent to Increase of/in As above, "of" is how much (increase of 15% = increased by 15%), "in" is the preposition for what increases, not by how much. To result from I To stem from, come from, is the result of; To result in To benefit of x To benefit from (benefit as a verb) To get the benefit of (noun use) To emphasize on X To emphasize X/emphasise X (a transitive verb) To put emphasis on X (noun use) The search of X x Search for X (but "in search of X") A clue on X x A clue to X A hint to X A hint of / to hint at something To discriminate X and Y x To distinguish/differentiate between X and Y In order to do X, we use Y R We use Y to do X Possibility to use x Possibility of using (OR: is possible to use) In the last 5 years I In the past 5 years ("past" is preferred for time phrases, "last" for all the others: "my last wife" or "my former wife". Even then, it can be ambiguous: the final or the former? If you mean the second here, use a clearer phrasing: "my former wife"). Till I Until Both X as well as Y x Both X and Y Modelised x Modelled or modeled Evolutionary history History (redundant) or evolution To study the occurence of the X phenomenon R Study X; or study the X phenomenon; or Study the X phenomenon To perform a fine tuning (or: an analysis) of X R To fine-tune X Occurence, etc. x Occurs, occurred, occurrence Sun, solar Sun, solar (if ours), as for Earth and Moon To explicit x Not an english verb, but suggests either "to make explicit" ot "to explain in detail" galactic bulge, (our) galaxy Galactic bulge, Galaxy The mentioned authors (i.e., mentioned earlier in the paper) The authors (or if too far in the article, rename them) Least squares technique x Least-square technique Close-by An adverb only ("He lives close-by"), so for an adjective use either "close" or "nearby" Like for example R Such as Latter ( for a list of 3+) x This word is used to refer to the second of 2 previous elements, not more. Use "last" or another pronoun alone ("this" or "these") Included also X; other phrases where "also" is understood, such as "In addition, ... also..." Included X; "In addition," or "also"; ... but  or however ... R These express the same thing, so use one or the other

The high/low vs. large/small or strong/weak problem: the left-hand column goves the attribute, the right-hand one the words that use them.
NB, some show up in two places.

 High or low Most words that are typically indicated by up/down graphs: Value, rate, redshift, degree, temperature, metallicity, luminosity, speed, velocity, contrast,  energy, frequency,  level, density, shear, extinction, pressure, eccentricity, inclination, proportion, abundance, fractionation, flux, background (or strong?) Big/large or small Scale, correlation (?), broadening (?), opacity, amplitude, mass, momentum, uncertainties, diffusivity, Can be either high/low or large/small It depends on the emphasis:  number, frequency, dispersion (both?), coefficients (or only large?) Short or long Time, length, timescale Strong or weak Pulse, current, correlation, gradient, flow, shear, dependence, velocity field, asymmetry, contrast, constraint, turbulence, instability, acceleration, anisotropy Tight or loose Often the same as "strong/weak": relationship, correlation

Expressions used too often: either jargon or simply wordy, but useful in its place.

 Is in agreement with Agrees with (This phrase is standard and clear, but do use it sparingly for very technical comparisons or where the normal phrase is awkward) In this paper Use only to contrast with another's paper or else in the abstract in the first sentence, if useful; otherwise, it is understood. Simply use the personal "we" when you feel it might not be clear you mean your own article. Quite, rather, somewhat These quantifiers are very imprecise; for instance, does "quite small" mean "very small" or "somewhat small"? In most cases the simple adjective is clearer and just as correct ("small"). Most scientists know that a quantifier without close measurement is inexact, so the adverbial quantification is not needed. In order to Rather than use only this phrase, vary with others, including the simple infinitive. There are places it is the only choice, so reserve it for these cases. Relative to; with respect to Some authors use this constantly and in different contexts, especially when meaning either "compared to" or "related to". This non-technical use makes the phrase very ambiguous, if not incorrect. As these are fairly technical expressions, we cannot always tell whether you mean the normal "compared to" and may query its use, just to have you check your context. Further: e.g., "It adds a further layer" This is being overused where "more", "another" ("It adds another layer"), "earlier", or even "then" is what is meant and is standard English. It means "more extended" not just a greater number of. Such or such as Being overused where "this" or "those" is what is meant. Non negligible "significant" or "of low significance" "Metal-poorer" or "More metal-poor"? Both are accepted, but why not the more standard ''is richer/poorer in metals'' in some cases?

## Astronomical objects: linking to databases

SIMBAD, the astronomical database, and ALADIN, the interactive deep sky mapping facility at the CDS Strasbourg, create anchors for astronomical objects cited in A&A. Object names that are tagged with the \object macro and verified will appear linked to the object information. As the one better placed to start the process and in order to help in the indexing, you should surround any astronomical object in your text, as well as in small tables with the command:

\object{objectname}

This command simply prints out its argument and adds the thus-marked element to the list of hyper-linked astronomical objects, so it should be repeated for each object.

In the referee version of your article or in the final (two-column) version, the list of your objects will automatically appear at the end (after the references). LaTeX will write an auxiliary file with the extension obj to prepare that list. Please, verify this list carefully.

Astronomical designations (also called Object Identifiers) are often confusing. We encourage you to test the stellar objects (in the *.tex file or in the *.obj file), using the sites and easy tools available at the CDS.

 TeX files: http://vizier.u-strasbg.fr/viz-bin/Object Obj files: http://vizier.u-strasbg.fr/viz-bin/Sesame

The Object Identifiers have been also collected and published by Lortet and collaborators in Dictionaries of Nomenclature of Celestial Objects outside the solar system (1994A&AS..107..193L). The information service available at http://vizier.u-strasbg.fr/cgi-bin/Dic is the electronic look-up version of the Dictionary, which is updated on a regular basis; it provides full references and usages about for 13211 different acronyms.

## A&A: Keywords

A&A: Keywords

The list is common to the major Astronomical and Astrophysical Journals. In order to ease the search, the keywords are subdivided into broad categories.
The parts of the keywords in italics are for reference only and should be omitted when the key are entered on the manuscript.

General
Editorials notices
Extraterrestrial intelligence
History and philosophy of astronomy
Miscellaneous
Obituaries, biographies
Publications, bibliography
Sociology of Astronomy
Standards

Physical data and processes
Asteroseismology
Astrobiology
Astrochemistry
Acceleration of particles
Accretion, accretion disks
Astroparticle physics
Atomic data
Atomic processes
Black hole physics
Chaos
Conduction
Convection
Dense matter
Diffusion
Dynamo
Elementary particles
Equation of state
Gravitation
Gravitational lensing: strong
Gravitational lensing: weak
Gravitational lensing: micro
Gravitational waves
Hydrodynamics
Instabilities
Line: formation
Line: identification
Line: profiles
Magnetic fields
Magnetic reconnection
Magnetohydrodynamics (MHD)
Masers
Molecular data
Molecular processes
Neutrinos
Nuclear reactions, nucleosynthesis, abundances
Opacity
Plasmas
Polarization
Relativistic processes
Scattering
Shock waves
Solid state: volatile
Solid state: refractory
Turbulence
Waves

Astronomical instrumentation, methods and techniques
Atmospheric effects
Balloons
Instrumentation: detectors
Instrumentation: high angular resolution
Instrumentation: interferometers
Instrumentation: miscellaneous
Instrumentation: photometers
Instrumentation: polarimeters
Instrumentation: spectrographs
Light pollution
Methods: analytical
Methods: data analysis
Methods: laboratory: atomic
Methods: laboratory: molecular
Methods: laboratory: solid state
Methods: miscellaneous
Methods: numerical
Methods: observational
Methods: statistical
Site testing
Space vehicles
Space vehicles: instruments
Techniques: high angular resolution
Techniques: image processing
Techniques: imaging spectroscopy
Techniques: interferometric
Techniques: miscellaneous
Techniques: photometric
Techniques: polarimetric
Techniques: spectroscopic
Telescopes

Astronomical data bases
Astronomical databases: miscellaneous
Atlases
Catalogs
Surveys
Virtual observatory tools

Astrometry and celestial mechanics
Astrometry
Celestial mechanics
Eclipses
Ephemerides
Occultations
Parallaxes
Proper motions
Reference systems
Time

The Sun
Sun: abundances
Sun: activity
Sun: atmosphere
Sun: chromosphere
Sun: corona
Sun: coronal mass ejections (CMEs)
Sun: evolution
Sun: faculae, plages
Sun: filaments, prominences
Sun: flares
Sun: fundamental parameters
Sun: general
Sun: granulation
Sun: helioseismology
Sun: heliosphere
Sun: infrared
Sun: interior
Sun: magnetic fields
Sun: oscillations
Sun: particle emission
Sun: photosphere
Sun: rotation
(Sun:) solar-terrestrial relations
(Sun:) solar wind
(Sun:) sunspots
Sun: transition region
Sun: X-rays, gamma rays

Planetary systems
Comets: general
Comets: individual: ...
Earth
Interplanetary medium
Kuiper belt: general
Kuiper belt objects: individual: ...
Meteorites, meteors, meteoroids
Minor planets, asteroids: general
Minor planets, asteroids: individual: ...
Moon
Oort Cloud
Planets and satellites: atmospheres
Planets and satellites: aurorae
Planets and satellites: composition
Planets and satellites: detection
Planets and satellites: dynamical evolution and stability
Planets and satellites: formation
Planets and satellites: fundamental parameters
Planets and satellites: gaseous planets
Planets and satellites: general
Planets and satellites: individual: ...
Planets and satellites: interiors
Planets and satellites: magnetic fields
Planets and satellites: oceans
Planets and satellites: physical evolution
Planets and satellites: rings
Planets and satellites: surfaces
Planets and satellites: tectonics
Planets and satellites: terrestrial planets
Protoplanetary disks
Planet-disk interactions
Planet-star interactions
Zodiacal dust

Stars
Stars: abundances
Stars: activity
Stars: AGB and post-AGB
Stars: atmospheres
(Stars:) binaries (including multiple): close
(Stars:) binaries: eclipsing
(Stars:) binaries: general
(Stars:) binaries: spectroscopic
(Stars:) binaries: symbiotic
(Stars:) binaries: visual
Stars: black holes
(Stars:) blue stragglers
(Stars:) brown dwarfs
Stars: carbon
Stars: chemically peculiar
Stars: chromospheres
(Stars:) circumstellar matter
Stars: coronae
Stars: distances
Stars: dwarf novae
Stars: early-type
Stars: emission-line, Be
Stars: evolution
Stars: flare
Stars: formation
Stars: fundamental parameters
Stars: general
(Stars:) Gamma-ray burst: general
(Stars:) Gamma-ray burst: individual: ...
(Stars:) Hertzsprung-Russell and C-M diagrams
Stars: horizontal-branch
Stars: imaging
Stars: individual: ...
Stars: interiors
Stars: jets
Stars: kinematics and dynamics
Stars: late-type
Stars: low-mass
Stars: luminosity function, mass function
Stars: magnetars
Stars: magnetic field
Stars: massive
Stars: mass-loss
Stars: neutron
(Stars:) novae, cataclysmic variables
Stars: oscillations (including pulsations)
Stars: peculiar (except chemically peculiar)
(Stars): planetary systems
Stars: Population II
Stars: Population III
Stars: pre-main sequence
Stars: protostars
(Stars:) pulsars: general
(Stars:) pulsars: individual ...
Stars: rotation
Stars: solar-type
(Stars:) starspots
Stars: statistics
(Stars:) subdwarfs
(Stars:) supergiants
(Stars:) supernovae: general
(Stars:) supernovae: individual: ...
Stars: variables: Cepheids
Stars: variables: delta Scuti
Stars: variables: general
Stars: variables: RR Lyrae
Stars: variables: T Tauri, Herbig Ae/Be
(Stars:) white dwarfs
Stars: winds, outflows
Stars: Wolf-Rayet

Interstellar medium (ISM), nebulae
ISM: abundances
ISM: atoms
ISM: bubbles
ISM: clouds
(ISM:) cosmic rays
(ISM:) dust, extinction
(ISM:) evolution
ISM: general
(ISM:) HII regions
(ISM:) Herbig-Haro objects
ISM: individual objects: ...
(except planetary nebulae)
ISM: jets and outflows
ISM: kinematics and dynamics
ISM: lines and bands
ISM: magnetic fields
ISM: molecules
(ISM:) planetary nebulae: general
(ISM:) planetary nebulae: individual: ...
(ISM:) photon-dominated region (PDR)
ISM: structure
ISM: supernova remnants

The Galaxy
Galaxy: abundances
Galaxy: bulge
Galaxy: center
Galaxy: disk
Galaxy: evolution
Galaxy: formation
Galaxy: fundamental parameters
Galaxy: general
(Galaxy:) globular clusters: general
(Galaxy:) globular clusters: individual: ...
Galaxy: halo
(Galaxy:) local insterstellar matter
Galaxy: kinematics and dynamics
Galaxy: nucleus
(Galaxy:) open clusters and associations: general
(Galaxy:) open clusters and associations: individual: ...
(Galaxy:) solar neighborhood
Galaxy: stellar content
Galaxy: structure

Galaxies
Galaxies: abundances
Galaxies: active
(Galaxies:) BL Lacertae objects: general
(Galaxies:) BL Lacertae objects: individual: ...
(Galaxies:) bulges
Galaxies: clusters: general
Galaxies: clusters: individual: ...
Galaxies: clusters: intracluster medium
Galaxies: distances and redshifts
Galaxies: dwarf
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: formation
Galaxies: fundamental parameters
Galaxies: general
Galaxies: groups: general
Galaxies: groups: individual: ...
Galaxies: halos
Galaxies: high-redshift
Galaxies: individual: ...
Galaxies: interactions
(Galaxies:) intergalactic medium
Galaxies: irregular
Galaxies: ISM
Galaxies: jets
Galaxies: kinematics and dynamics
(Galaxies:) Local Group
Galaxies: luminosity function, mass function
(Galaxies:) Magellanic Clouds
Galaxies: magnetic fields
Galaxies: nuclei
Galaxies: peculiar
Galaxies: photometry
(Galaxies:) quasars: absorption lines
(Galaxies:) quasars: emission lines
(Galaxies:) quasars: general
(Galaxies:) quasars: individual: ...
(Galaxies:) quasars: supermassive black holes
Galaxies: Seyfert
Galaxies: spiral
Galaxies: starburst
Galaxies: star clusters: general
Galaxies: star clusters: individual: ...
Galaxies: star formation
Galaxies: statistics
Galaxies: stellar content
Galaxies: structure

Cosmology
(Cosmology:) cosmological parameters
Cosmology: miscellaneous
Cosmology: observations
Cosmology: theory
(Cosmology:) dark matter
(Cosmology:) dark energy
(Cosmology:) distance scale
(Cosmology:) early Universe
(Cosmology:) large-scale structure of Universe
(Cosmology:) inflation
(Cosmology:) dark ages, reionization, first stars
(Cosmology:) primordial nucleosynthesis

Resolved and unresolved sources as a function of wavelength
Gamma rays: diffuse background
Gamma rays: galaxies
Gamma rays: galaxies: clusters
Gamma rays: general
Gamma rays: ISM
Gamma rays: stars
Infrared: diffuse background
Infrared: galaxies
Infrared: general
Infrared: ISM
Infrared: planetary systems
Infrared: stars
Submillimeter: diffuse background
Submillimeter: galaxies
Submillimeter: general
Submillimeter: ISM
Submillimeter: planetary systems
Submillimeter: stars
Ultraviolet: galaxies
Ultraviolet: general
Ultraviolet: ISM
Ultraviolet: planetary systems
Ultraviolet: stars
X-rays: binaries
X-rays: bursts
X-rays: diffuse background
X-rays: galaxies
X-rays: galaxies: clusters
X-rays: general
X-rays: individuals: ...
X-rays: ISM
X-rays: stars

## Example of a manuscript header with structured abstract

\documentclass{aa}
\usepackage[varg]{txfonts}

\begin{document}

\title{Optimality relationships for $p$-cyclic SOR p
\thanks{Research supported in part by the US Air Force
under grant no. AFOSR-88-0285 and
the National Science Foundation under grant
no. DMS-85-21154}\fnmsep
\thanks{This is a second footnote}\\
resulting in asymptotically faster convergence\\
for the same amount of work per iteration}

\subtitle{II. An example text with infinitesimal
scientific value\\
whose title and subtitle may also be split}

\author{Daniel J. Pierce\inst{1}
Department of Computer Science, Purdue University,
West Lafayette, IN 47907, USA}
\and Robert J. Plemmons\inst{3}}

\offprints{R. Plemmons, \email{plemmons@...}}

\institute{Boeing Computer Service, P.O. Box 24346,
MS 7L-21, Seattle, WA 98124-0346, USA
\and Department of Mathematics, University of Ioannina,
GR-45 1210, Ioannina, Greece
\and Department of Computer Science and Mathematics,
North Carolina State University, Raleigh, NC 27695-8205, USA}

\date{Received 2 November 1992 / Accepted 7 January 1993}

\abstract {} {We look for characteristics typical of water-megamaser galaxies
in SO 103-G035, TXS 2226-184, and IC 1481.} {We obtained long-slit optical
emission-line spectra.} {We present rotation curves, line ratios, electron
densities, temperatures. IC 1481 reveals a spectrum suggestive of a vigorous
starburst in the central kiloparsec 108 years ago.} {We do not find any hints
for outflows nor special features which could give clues to the unknown
megamaser excitation mechanism.}

\keywords{interstellar medium: jets and outflows --
interstellar medium: molecules -- stars: pre-main-sequence}}
\maketitle

\documentclass{aa}
\usepackage[varg]{txfonts}

\begin{document}

title{Optimality relationships for $p$-cyclic SOR p
\thanks{Research supported in part by the US Air Force
under grant no. AFOSR-88-0285 and
the National Science Foundation under grant
no. DMS-85-21154}\fnmsep
\thanks{This is a second footnote}\\
resulting in asymptotically faster convergence\\
for the same amount of work per iteration}

\subtitle{II. An example text with infinitesimal
scientific value\\
whose title and subtitle may also be split}

\author{Daniel J. Pierce\inst{1}
Department of Computer Science, Purdue University,
West Lafayette, IN 47907, USA}
\and Robert J. Plemmons\inst{3}}

\offprints{R. Plemmons, \email{plemmons@... plemmons@...}

\institute{Boeing Computer Service, P.O. Box 24346,
MS 7L-21, Seattle, WA 98124-0346, USA
\and Department of Mathematics, University of Ioannina,
GR-45 1210, Ioannina, Greece
\and Department of Computer Science and Mathematics,
North Carolina State University, Raleigh, NC 27695-8205, USA}

\date{Received 2 November 1992 / Accepted 7 January 1993}

\abstract{We look for characteristics typical of water-megamaser galaxies
in SO 103-G035, TXS 2226-184, and IC 1481. We obtained long-slit optical
emission-line spectra. We present rotation curves, line ratios, electron
densities, temperatures. IC 1481 reveals a spectrum suggestive of a vigorous
starburst in the central kiloparsec 108 years ago. We do not find any hints
for outflows nor special features which could give clues to the unknown
megamaser excitation mechanism.}

\keywords{interstellar medium: jets and outflows --
interstellar medium: molecules -- stars: pre-main-sequence}}
\maketitle

## Examples of tables and figures

### Figures

Include the package in the preamble of your document as follows:

 \usepackage{graphicx}

To fill the whole column width, the figure has to be resized with the resizebox command.

\begin{figure}
\resizebox{\hsize}{!}{\includegraphics{<yourfilename.eps>}}
\end{figure}

For a two-column-wide plot, substitute figure by figure*.

\begin{figure*}
\centering
\includegraphics[width=17cm]{<yourfilename.eps>}
\end{figure*}

A&A also uses a third width, 12 cm; that is, with the figure caption at its lower right-hand side. To achieve this format, use

\begin{figure*}
\sidecaption
\includegraphics[width=12cm]{<yourfilename.eps>}
\end{figure*}

### Simples tables

Simple tables must be prepared as in the example below.

 HJD E Method#2 Method#3 1 50 -837 970 2 47 877 230 3 31 25 415 4 35 144 2356 5 45 300 556

The corresponding TEX code is as follows

\begin{table}
\caption{Nonlinear Model Results}              % title of Table
\label{table:1}      % is used to refer this table in the text
\centering                                      % used for centering table
\begin{tabular}{c c c c}          % centered columns (4 columns)
\hline\hline                        % inserts double horizontal lines
HJD & $E$ & Method\#2 & Method\#3 \\    % table heading
\hline                                   % inserts single horizontal line
1 & 50 & $-837$ & 970 \\      % inserting body of the table
2 & 47 & 877      & 230 \\
3 & 31 & 25        & 415 \\
4 & 35 & 144      & 2356 \\
5 & 45 & 300      & 556 \\
\hline                                             %inserts single line
\end{tabular}
\end{table}

To produce two columns width tables, use the table* environment. If a horizontal line is required in the table, the \cline{n-m} command is used to draw a horizontal line from the left side of the column n to the right side of the column m. The \multicolumn{num}{col}{text} command is used to combine the following num columns into a single column with their total width:

\hline\hline                         % inserts double horizontal lines
HJD & \multicolumn{3}{c}{Methods}\\
\hline                                  % inserts single horizontal line

The output is:

 HJD Methods 1 50 -837 970 2 47 877 230 3 31 25 415 4 35 144 2356 5 45 300 556

Some examples of a table with footnotes or a rotated table in landscape are given in the aa.dem file.

### Large tables (longer than one page)

Tables larger than a page should be composed at the end of the document.

\end{thebibliography}
\begin{longtable}{lllrrr}
\caption{\label{kstars} Sample stars with absolute magnitude}\\
\hline\hline
Catalogue& $M_{V}$ & Spectral & Distance & Mode & Count Rate \\
\hline
\caption{continued.}\\
\hline\hline
Catalogue& $M_{V}$ & Spectral & Distance & Mode & Count Rate \\
\hline
\hline
\endfoot
Gl 33        & 6.37 & K2 V & 7.46 & S & 0.043170\\
Gl 66AB   & 6.26 & K2 V & 8.15 & S & 0.260478\\
Gl 68        & 5.87 & K1 V & 7.47 & P & 0.026610\\
&          &          &           & H & 0.008686\\
Gl 86
\footnote{Source not included in the HRI catalog. See Sect.~5.4.2 for details.}
& 5.92 & K0 V & 10.91& S & 0.058230\\
\end{longtable}

Some other examples are given in the aa.dem file.

### Notes to tables

A&A LaTex macro package provides some special commands to format notes in the tables in the proper A&A layout, as illustrated in the examples given below.
• References below the table:

They are introduced in the TEX file using the command \tablebib, as in the example below.

 SN name Epoch Bands References (with respect to B maximum) 1981B 0 UBV 1 1986G -3, -1, 0, 1, 2 BV 2 1989B -5, -1, 0, 3, 5 UBVRI 3, 4 1990N 2, 7 UBVRI 5 1991M 3 VRI 6 SNe 91bg-like 1991bg 1, 2 BVRI 7 1999by -5, -4, -3, 3, 4, 5 UBVRI 8 SNe 91T-like 1991T -3, 0 UBVRI 9, 10 2000cx -3, -2, 0, 1, 5 UBVRI 11
References. (1) Branch et al. (1983); (2) Philipps et al. (1987); (3) Barbon et al. (1990); (4) Wells et al. (1994); (5) Mazzali et al. (1993); (6) Gomez et lopez (1998); (7) Kirshner et al. (1993); (8) Patat et al. (1996); (9) Salvo et al. (2001); (10) Branch et al. (2003); (11) Jha et al. (1999).

The corresponding TEX code is as follows:

\begin{table*}
\caption ...
\begin{tabular}
... Content of the table
...
\hline
\end{tabular}
\tablebib{
(1)~\citet{branch83}; (2) \citet{phillips87}; (3) \citet{barbon90}; (4) \citet{wells94};
(5) \citet{mazzali93}; (6) \citet{gomez98}; (7) \citet{kirshner93}; (8) \citet{patat96};
(9) \citet{salvo01}; (10) \citet{branch03}; (11) \citet{jha99}.
}
\end{table*}

• Notes below the table:

Notes can refer to special portions of the table and be introduced with superscripts. In this case, the author should use the command \tablefootmark and \tablefoottext. Notes can also include general remarks on the whole table. In this case, the note is not preceded with a superscript and is introduced with the command \tablefoot. A detailed example is given below, followed by the related TEX code.

 Star Spectral type RA(J2000) Dec(J2000) 69 B1V 09 15 54.046 -50 00 26.67 49 B0.7V *09 15 54.570 -50 00 03.90 LS 1267 (86) O8V 09 15 52.787 11.07a 24.6 7.58a 1.37a 0.20a LS 1262 B0V 09 15 05.17 11.17b MO 2-119 B0.5V 09 15 33.7 11.74c LS 1269 O8.5V 09 15 56.60 10.85d
Notes.  The top panel shows likely members of Pismis 11. The second panel contains likely members of Alicante 5. The bottom panel displays stars outside the clusters.
(a) Photometry for MF13, LS 1267 and HD 80077 from Dupont et al. (b) Photometry for LS 1262, LS 1269 from Durand et al. (c) Photometry for MO2-119 from Mathieu et al.

\begin{table}
\caption{\label{t7}Spectral types and photometry for stars in the region.}
\centering
\begin{tabular}{lccc}
\hline\hline
Star&Spectral type&RA(J2000)&Dec(J2000)\\
\hline
69 &B1\,V &09 15 54.046 & $-$50 00 26.67\\
49 &B0.7\,V &*09 15 54.570& $-$50 00 03.90\\
LS~1267~(86) &O8\,V &09 15 52.787&11.07\tablefootmark{a}\\
24.6 &7.58\tablefootmark{1}&1.37\tablefootmark{a} &0.20\tablefootmark{a}\\
\hline
LS~1262 &B0\,V &09 15 05.17&11.17\tablefootmark{b}\\
MO 2-119 &B0.5\,V &09 15 33.7 &11.74\tablefootmark{c}\\
LS~1269 &O8.5\,V &09 15 56.60&10.85\tablefootmark{d}\\
\hline
\end{tabular}
\tablefoot{
The top panel shows likely members of Pismis~11. The second panel contains likely
members of Alicante~5. The bottom panel displays stars outside the clusters.\\
\tablefoottext{a}{Photometry for MF13, LS~1267 and HD~80077 from Dupont et al.}
\tablefoottext{b}{Photometry for LS~1262, LS~1269 from Durand et al.}
\tablefoottext{c}{Photometry for MO2-119 from Mathieu et al.}
}
\end{table}

Some other examples of large, online tables are also given in the aa.dem file.

## Figures

Figures submitted to the Journal must be of the highest quality to ensure accuracy and clarity in the final published copy. You can supply graphics in eps, pdf, jpg, png, and tiff formats, or as native Photoshop/Illustrator files. We recommend that you refrain from using conversion tools that might decrease the quality of the figures.

We urge the author to limit the empty space in and around figures. Artwork should be in sharp focus, with clean, clear numbers and letters and with sharp black lines. Thin lines should be avoided, particularly in figures requiring considerable reduction. Authors should check whether laser-printed originals of these figures are acceptable (especially for grayscale).

The author is warned that changes in the size and arrangement of figures can made by the publisher at the production stage. Because of the bulk of the Journal, the production office will reduce most figures to fit a one-column format (88 mm). If necessary, figures may extend across the entire page width (max. 180 mm). Intermediate widths with a side caption are also possible (max. 120 mm). The illustrations should be placed at the top of the column and flush-left according to layout conventions.

If lettered parts of a figure (e.g., 1a, 1b, 1c, etc.) are referred to in the figure legend, each part of the figure should be labeled with the appropriate letter within the image area. Symbols should be explained in the caption and not in the figure. Please use lower case for any words in figures to comply with the A&A style.

See appendix \ref{app:ex-tex-fig} for examples of how figures should be coded in the TeX file.

Depending of your preferred LaTeX engine (LaTeX or pdfLaTeX), figures should be sent as encapsulated PostScript files or in any other format as PDF, JPG, TIFF, PNG, BMP, and GIF (compatible with pdfLaTeX).

All graphics are either vector graphics or bitmap graphics. Vector figures are graphics consisting of individual, scalable objects such as lines, curves, and shapes with editable attributes, therefore you can resize a vector without loss of quality. The bitmap figures are graphics composed of dots called pixels. Because bitmaps have a fixed resolution, enlarging or reducing them produce jagged and distorted images because extra pixels are added or supressed. Some software packages leave a considerable margin around the figures. You may have to adjust the BoundingBox for EPS figures by hand with the help of ghostview, for example. The figure can also be automatically changed with the psfixbb command, which you will find in almost any LaTeX distribution.

For other formats as PDF, JPG, and bitmap formats, crop out any extra spaces around the figures and also check very carefully that the resolution is at least 250/300 dpi and not 92 dpi, as in standard screen JPG files. The easiest way to include your figures is by using the graphicx package, which comes along with the standard LaTeX2e distribution. See the document by Keith Reckdahl "Using Imported Graphics in LaTeX2e", which explains how to use imported graphics in LaTeX2e documents. The Part I, Background Information provides historical information and describes basic LaTeX2e terminology and graphic formats.

## Tables

Tables should be prepared using the table environment, following the examples given below.

Tables should be self-explanatory. The table headings should contain the essential information needed to understand the data presented. Details should not clutter the header and are better presented as explanatory footnotes. Large tables containing primary data can be archived at the CDS. For details about archival at the CDS, please refer to paragraph Publishing data at the CDS

Table columns should be set flush left. Vertical lines are normally not necessary and should be inserted only in exceptional cases for the sake of clarity. The height of each table, including the caption, usually must not exceed 23.5 cm, and the caption should always be placed above the table.

Detailed examples of TEX code for tables are provided here for simple A&A tables and here for tables longer than one page.

## Publishing data at the CDS

By contract with the Journal, the CDS archives the primary data that are published in A&A and puts them at the disposal of the global community. The data are also linked to the general purpose data-mining tools developed at the CDS. These archived data can be primary observational material, catalogs, theoretical tables of lasting values, etc.

The CDS requires the data tables to be in ASCII format. Each table is accompanied by a readme.txt file that describes the table's content. The readme file format defines a standard that is used by all major astronomy journals. Again by contract with the Journal, the CDS provides help to A&A authors in order to prepare the files. Primary data can also be archived at the CDS as graphics files in FITS format. This is of particular interest for spectrograms.

Tables made available in electronic form at the CDS should be prepared according to the conventions explained below and they should be sent to the CDS upon acceptance of the paper, preferably using the submission form proposed on the CDS web site. Alternatively, the tabular material can be sent by e-mail to This email address is being protected from spambots. You need JavaScript enabled to view it. , or by ftp to cdsarc.u-strasbg.fr.

The electronic versions of the tables are systematically checked for consistency at the CDS, and the author may have to communicate with the CDS about missing descriptions or detected inconsistencies.

## Preparation of the electronic tables

Tables to be published in electronic form at the CDS should preferably be prepared as plain ASCII files, one file per table; the description of all table layouts and contents should be gathered into a file named ReadMe, a template of which can be copied from ftp://cdsarc.u-strasbg.fr/pub/J/A+A/ReadMe.txt. In addition to the description of the tabular material, the role of the ReadMe file is to supply minimal details about the context and the history of the data. Detailed instructions for the preparation and the submission of the tabular data can be found at
http://cdsweb.u-strasbg.fr/submit/; specific questions can be addressed to
This email address is being protected from spambots. You need JavaScript enabled to view it. .

Reference to the material published electronically should appear in the text, including a description of the column headings of tabular material. The following text is an example of such a description: "Table 1, available at the CDS, contains the following information. Column 1 lists the name of the source, Column 2 gives the bolometric luminosity...". Alternatively, an excerpt from the table (a few lines) can be inserted in the article.

## Retrieving electronic tables

For all papers, including old papers that do not have an electronic version, the online tables can be obtained from the CDS:

• by ftp:
cd pub/A+A//
mget * (to get all files)

• by web access from:
http://cdsweb.u-strasbg.fr/A+A.htx
http://cdsweb.u-strasbg.fr/A+AS.ht

## The reference list

The reference list should contain all the references cited in the text, ordered alphabetically by surname (with initials following). If there are several references to the same first author, they should be entered according to the following scheme:

1. One author: chronologically
2. Author, one co-author: alphabetically by co-author, then chronologically
3. Author, two or more co-authors: chronologically.

The first three author's names are given, followed by "et al.", for papers written by a group of more than five authors.

Papers in preparation (not yet submitted to a journal) are not to be displayed in the reference list and are to be listed as "in prep." in the main text, without any date.
Private communications are not listed either and may be acknowledged as "YYYY, priv. comm." in the main text.
For papers submitted to a journal that are not yet published, please give the year of submission/acceptation, the name of the journal, and its status: submitted (not yet accepted), or in press. Citations should only mention the year given in the reference.

The A&A format for references is as follows:

• Bohr, N., Einstein, A., & Fermi, E. 1992, MNRAS, 301, 257 (BEF)
• Curie, M., & Curie, P. 1991, A&A, 248, 612
• de Gaulle, C. 1996, Solar Phys. (Oxford Univ. Press, Oxford)
• Heisenberg, W., & West, C. N. 1993, Australian J. Phys., 537, 36 (Paper III)
• Laurel, S., & Hardy, O. 1994, Active Galactic Nuclei, in The Evolution and Distribution of Galaxies, ed. W. Churchill, F. D. Roosevelt, & J. Stalin (Wiley, New York), 210

To set the reference list in the proper A&A format, we encourage you to use BibTeX and the natbib package instead of the standard thebibliography environment.

## How to used BibTeX for A&A

For extensive description of the general use of BibTeX, please see for example The LaTeX Companion p.757 (Franck Mittelbach and Michel Goosens, second edition).

To use BibTeX, you must:

1. Create a database (.bib) file that describes the articles or books you want to reference. The NASA Astrophysics Data System (ADS) provides automatic tools for retrieving a .bib file including entries for a selection of articles. An example of a typical .bib file is also provided in the A&A LaTeX macro package.
2. Specify the style and location of the bibliography in your TEX document. The A&A package includes a style file aa.bst that will format your reference list in the proper A&A format. Before running BibTeX you must ensure that the requested files (i.e. bib, bst and sty files) are in the same directory as your TEX files.
3. Run BibTeX then run LaTeX. Remember you must run LaTeX twice to update the citations.

In the TEX file, the references list is enclosed as follows:

 \documentclass{aa} ... \usepackage{natbib} \bibpunct{(}{)}{;}{a}{}{,} % to follow the A&A style ... % for the bibliography, at the end \bibliographystyle{aa} % style aa.bst \bibliography{Yourfile} % your references Yourfile.bib \end{document} 

## Citations in the text

References are normally cited in the text by placing the name(s) and the year in parentheses, without any comma between them. If there are two authors for one citation, both names should be given, separated by an ampersand (&). If there are more than two authors, only the first name should be given, followed by "et al.". Commas should be used only to separate two or more years linked with one author (author group). If two or more citations are made in one set of parentheses, they should be separated by a semi-colon. If more than one citation for a particular author (author group) is made for the same year, "a", "b", "c", etc. should be added to the year. If citations are made within the normal running text, only the year(s) should be placed in parentheses. The following examples illustrate the required style:

 (Copernicus 1986) (Copernicus & Galilei 1988) (Hubble et al. 1985; Newton et al. 1987; Ptolemaus & Copernicus 1988a, 1988b, 1992) Recently Galilei et al. (1991, 1992) showed that ...

Authors' initials are permitted only in exceptional cases, for example, to distinguish between two authors with the same surname. Each literature citation made in the text should have a corresponding entry in the References at the end of the paper. For frequently cited papers, an abbreviated form of citation is recommended, e.g., Paper I, Paper II (if appropriate) or by the initial letters of the authors' surnames.

The Natbib package provides citation commands that automatically format the citations in the proper format. The command \citet is to be used for textual citations, while the command \citep is to be used for parenthetical citations. Some examples are given below.

 \citet{jon90} Jones et al. (1990) \citep{jon90} (Jones et al. 1990) \citep[see][]{jon90} (see Jones et al. 1990) \citep[see][chap.~2]{jon90} (see Jones et al. 1990, chap. 2)

Multiple citations can be made as usual, by including more than one citation key in the \cite command argument.

 \citet{jon90}, \citet{jam91}, and \citet{li98} Jones et al. (1990), James et al. (1991), and Li (1998) \citep{jon90,jam91} (Jones et al., 1990; James et al. 1991) \citep{jon90,jon91} (Jones et al. 1990, 1991) \citep{jon90a,jon90b} (Jones et al. 1990a,b)

## ADS BibTeX records for citing ASCL and ArXiV entries

A&A Bibtex style now supports the “eprint” field for referring to eprints. Eprint entries may be added to your bibtex databases. Note that the entry Bibtex format now provided by ADS is also compatible:

@ARTICLE{2011ascl.soft07005F,
author = {{Freeman}, P. and {Nguyen}, D. and {Doe}, S. and {Siemiginowska}, A.},
title = “{Sherpa: CIAO Modeling and Fitting Package}”,
journal = {Astrophysics Source Code Library},
year = 2011,
month = jul,
eprint = {ascl:1107.005},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

It is also possible to use the extension “archivePrefix” in BibTeX:

@ARTICLE{2011ascl.soft07005F,
author = {{Freeman}, P. and {Nguyen}, D. and {Doe}, S. and {Siemiginowska}, A.},
title = “{Sherpa: CIAO Modeling and Fitting Package}”,
journal = {Astrophysics Source Code Library},
year = 2011,
month = jul,
archivePrefix = "ascl",
eprint = {1107.005},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

An ArXiv example:

@ARTICLE{loinard12,
author = {{Loinard}, L. and {Zapata}, L.~A. and {Rodriguez}, L.~F. and
{Pech}, G. and {Chandler}, C.~J. and {Brogan}, C.~L. and {Wilner}, D.~J. and {Ho}, P.~T.~P. and {Parise}, B. and {Hartmann}, L.~W. and {Zhu}, Z. and {Takahashi}, S. and {Trejo}, A.},
title = "{ALMA and VLA observations of the outflows in IRAS 16293-2422}",
journal = {ArXiv e-prints},
archivePrefix = "arXiv",
eprint = {1211.4744},
keywords = {Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Galaxy Astrophysics},
year = 2012,
month = nov,
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

After running LaTeX and BibTeX on it, an entry is generated in the .bbl file, which looks like:

\bibitem[{{Freeman et al.}(2011)]{2011ascl.soft07005F}
{Freeman}, P., {Nguyen}, D., {Doe}, S., and {Siemiginowska}, A. 2011
Astrophysics Source Code Library, \eprint{ascl:1107.005}

Or

\bibitem[{{Loinard} {et~al.}(2012){Loinard}, {Zapata}, {Rodriguez}, {Pech}, {Chandler}, {Brogan}, {Wilner}, {Ho}, {Parise}, {Hartmann}, {Zhu}, {Takahashi}, \& {Trejo}}]{loinard12}
{Loinard}, L., {Zapata}, L.~A., {Rodriguez}, L.~F., {et~al.} 2012, ArXiv e-prints [\eprint[arXiv]{1211.4744}]

The aa class now includes the “\eprint” command, which will appear in your final article as a link in both the PDF file and the HTML format.

• Loinard, L., Zapata, L. A., Rodriguez, L. F., et al. 2012, MNRAS, accepted [arXiv:1211.4744]

### Remarks

Please note that it is mandatory to add the eprint number when the entries are:

journal = {Astrophysics Source Code Library} and journal = {ArXiv e-prints}.

## Appendices

The appendices will be enclosed after the references list.

In the LaTeX file, appendix sections should appear as follows:

\begin{appendix} \section{Title of the first appendix} ... \section{Title of the second appendix} ... \end{appendix} 

The command \begin{appendix} must be entered before the first appendix. Then all sections that follow will be numbered with capital letters.

## The main text

Manuscripts should be divided into numbered sections and subsections, starting with "1. Introduction". Subsections should be numbered 2.1, 2.2, 3.1, etc. All sections must have a short descriptive title. In the TEX file, the sections appear as follows.

 \section{Title} \subsection{Title} \subsubsection{Title} \paragraph{Title} 

## Cross-referencing

Please always give a \label where possible (figures, tables, section) and use \ref for cross-referencing. Such cross-references will be converted to HTML hyper-links. The \cite- and \bibitem-mechanism for bibliographic references as well as the \object command is also mandatory.

## Acknowledgements

A special section for acknowledgements may be included before the References list. It will appear as follows:

\begin{acknowledgements} ... \end{acknowledgements}

## Some aspects of typographic style within the text

The following expressions should always be abbreviated unless they appear at the beginning of a sentence (i.e. Sect., Sects., Fig., Figs., Col., Cols.). Table is never abbreviated.

Abbreviations of concepts, methods, instruments, observatories, etc may be used throughout the text, but the full wording followed by the abbreviation in parentheses should be given once in the Abstract (if appropriate) and/or once when first mentioned in the main text (usually in the Introduction).

Examples: ...very long baseline interferometry (VLBI)...; ... Westerbork Radio Telescope (WRT)...

## The preamble of your TEX file

\documentclass{aa}

To get the standard A&A 2-column-layout (i.e. single-line spacing), you have to include this command at the beginning of your article.

\documentclass[referee]{aa}

Both for refereeing purposes and, after acceptance, for language editing purposes, the authors are requested to send their article in "Referee format", i.e. with a special double-line spacing layout. To set this class option, please include the referee option. This special layout also provides a list of all astronomical objects indexed with the \object command.

\documentclass[letter]{aa}

There is a special layout for Letters. The mention "Letter to the Editor" is automatically added.

\documentclass[longauth]{aa}

In articles that are the result of consortia, the number of authors and the list of affiliations are very long. With the longauth option, all the institutes are set below the references.

\documentclass[onecolumn]{aa}

Some papers contain a lot of large mathematical formulae that are sometimes cannot be read easily and cannot be written in a 2-column format. In this case, the authors can submit their articles using the option onecolumn. After the submission, the editors will confirm that the article will actually be displayed in 1 column, right across the page.

\documentclass[bibyear]{aa}

If you don't use structured references (according to the author-year natbib style), add this option.

## TX fonts

A&A uses the Postscript TX Times-fonts. The TX fonts consist of virtual text roman fonts using Adobe Times with some modified and additional text symbols. The TX fonts are distributed under the GNU public license and are available in the distributions of LaTeX since December 2000.

 \documentclass{aa} \usepackage[varg]{txfonts} ... \begin{document} 

As the use of the TX fonts results in a slightly different page make-up from CM fonts, we encourage you to use TX fonts, following this example.

## Title

Make the title short and communicative; do not use acronyms, except those that are in general use; avoid acronyms known only to those deeply specialized. The main title and the subtitle should not be capitalised, except for the first letter and any other words that are always capitalised. Math variables and symbols should be typeset as in the text.

In the manuscript TEX file, please code the title and subtitle of your article as follows:

 \title{your title} \subtitle{your subtitle} 

If a long \title or \subtitle needs to split across two or more lines, please insert linebreaks (\\).

For every manuscript, all authors and all addresses should be listed. Addresses should contain e-mail addresses where possible. A number should precede each address and the authors' names should be marked with the appropriate numerical superscript(s). Unless the authors request otherwise, the e-mail addresses will be included in the affiliation to facilitate information exchange between readers and authors.

### Names of authors

The preferred form for each name is: initial(s) of the forename(s) followed by the family name.

 \author{first author name \and second author name \and third author name... } 

If there is more than one author, the order is optional. The names should be separated by \and. If the authors have different affiliations, each name has to be followed by \inst{}. Numbers referring to different addresses should be attached to each author, pointing to the corresponding institute.

A&A offers authors the possibility of being identified with non-Roman alphabets, such as Chinese, Japanese, Cyrillic characters (see specific instructions here).

\institute{name of the first institute \and name of the second institute} 

If there is more than one address, the entries are numbered automatically with \and, in the order in which you type them. Please make sure that the numbers match those placed next to the authors' names.

The authors' institutes can also be given using labels, so that there is no need to rewrite the full institutes list if the order of the authors changes during the evaluation process. An example is given below:

 \author{V.~Arsenijevic\inst{\ref{inst1}}\and S.~Fabbro\inst{\ref{inst2}}\and A.~M.~Mour\~ao\inst{\ref{inst3}}\and A.~J.~Rica da Silva\inst{\ref{inst1}}} \institute{Multidisciplinar de Astrof\'{\i}sica, IST, Avenida Rovisco Pais, 1049 Lisbon, Portugal\email{...}\label{inst1} \and < Multidisciplinar de Astrof\'{\i}sica, IST, Avenida Rovisco Pais, 1049 Lisbon, Portugal\email{...}\label{inst2} \and Multidisciplinar de Astrof\'{\i}sica, IST, Avenida Rovisco Pais, 1049 Lisbon, Portugal\email{...}\label{inst3} } 

In the case of large collaborations involving several tens of authors, a special formatting of the authors' list is requested in order to save space. With the longauth option, all the institutes are set below the references (see section Loading the class).

## Footnote to the title block

...\thanks{text of footnote}

If footnotes to the title, subtitle, author's names or institute addresses are needed, please use thanks immediately after the word where the footnote indicator should be placed. These footnotes are marked by asterisks (*). If you need more than one consecutive footnote, use \fnmsep to typeset the comma separating the asterisks (see example in the file aa.demavailable in the macro package).

## Dates of receipt and acceptance

Enter the receipt and acceptance dates as follows:

\date{Received date / Accepted date }

The date is in format "day month year" (e.g., 1 January 2005).

The receipt and acceptance dates of your manuscript will be set by the editors and inserted by the publisher.

## Abstract

A new concept "Structured Abstract" is implemented with the version 6.0 of the A&A macro package. Just like a traditional abstract, a structured abstract summarizes the content of the paper, but it does make the structure of the article explicit and visible. For doing so, the structured abstract uses headings that define several short paragraphs. Three paragraphs, entitled respectively Aims, Methods, and Results, are mandatory. When appropriate, the structured abstract may use an introductory paragraph entitled Context, and a final paragraph entitled Conclusions.

Proceed as follows:

\abstract {}{}{}{}{} 

The second, third and fourth arguments have to be completed. The first one and the last one might be left empty. For example:

\abstract {} {Text of aims} {Text of methods} {Text of results} {}

The abstract should accurately summarize the paper's content, be limited to 300 words, and be self-contained (no references, and abbreviations or acronyms should be introduced). A counter of words has been added with an error message for an abstract exceeding 300 words. Citations in an abstract display an error message. Please note that abstract is a command with 5 arguments, and not an environment.

Remark: Authors who prefer to keep a non-structured an unstructured format can do so using the command \abstract{..} which will make the abstract a single paragraph without headings.

## Key words

A maximum of 6 key words should be listed after the abstract. These must be selected from a list that is published each year in the first issue in January. This list is common to the major astronomical and astrophysical journals.

List of key words.

\keywords{stars: chromospheres -- stars: late-type -- stars: winds, outflows -- radio continuum: stars }

## Formatting the header and the running title

Having entered the commands described above to set the title block of the article, please format the complete heading of your article by typing:

\maketitle

If you leave it out, the work done so far will produce no text. The command \maketitle will automatically generate the running title, derivating it from the author and title inputs. If the title is too long for the space available, you will be asked to supply a shorter version. In this case, enter before \maketitle :

 \titlerunning{short title} \authorrunning{name(s) of author(s)} 

If there are two authors, both names, separated by an ampersand (&, coded as \&), should be given; if there are more than two authors, the name of the first plus et al.should be given. The title should be shortened to a maximum of about 60 characters, spaces ignored, following the wording of the original title as closely as possible. If a paper has a numbered subtitle, the main title (length permitting) should be given, followed by the roman numeral of the subtitle.

The Editors reserve the right to modify the running head suggested by the authors, should this be necessary.

The required style is illustrated below (the colon will be inserted by the macro):

N. Copernicus: How active is NGC 4258?
E. Hertzsprung & E.P. Hubble: Optical spectroscopy of WR stars in M33 and M31. II
A.S. Eddington et al.: Infrared lines as probes of solar magnetic features. IV
C. Barbieri et al.: (RN) First HST/FOC images of the low mass companion of the astronomic binary Gliese 623

The section LaTeX examples provides an example of a manuscript header coded with LaTeX.