Table 1: Observational parameters of the two H I surveys combined, and further corrected, to form the LAB Survey of Galactic H I.
Parameter IAR / Villa Elisa Leiden/Dwingeloo

Antenna diameter 30 m 25 m

Main beam FWHM 30 $\hbox{$.\mkern-4mu^\prime$ }$ 0 35 $\hbox{$.\mkern-4mu^\prime$ }$ 7

Mounting equatorial alt-az

Declination range < $-25\hbox{$^\circ$ }$ > $-30\hbox{$^\circ$ }$

System temperature $\sim$ 35 K $\sim$ 35 K

Front end HEMT He-cooled FET He-cooled

rms noise $\sim$ 0.07 K $\sim$ 0.09 K

Back end 1008 channel DAC 1024 channel DAC

Bandwidth 5 MHz 5 MHz

Velocity coverage -450 to +450 km s^-1 -450 to +400 km s^-1

Velocity resolution 1.27 km s^-1 1.25 km s^-1

Channel separation 1.05 km s^-1 1.03 km s^-1

IAU standard regions S9 S8 and S7

Observing dates 1994 to 2000 1989 to 1993

Number of spectra 50 980 138 830

Grid in l, b $0\hbox{$.\!\!^\circ$ }5$ /cos(b), $0\hbox{$.\!\!^\circ$ }5$ $0\hbox{$.\!\!^\circ$ }5$ /cos(b), $0\hbox{$.\!\!^\circ$ }5$

**Table 1:** Observational parameters of the two H I surveys combined, and further corrected, to form the LAB Survey of Galactic H I.
Parameter	IAR / Villa Elisa	Leiden/Dwingeloo
Antenna diameter	30 m	25 m
Main beam FWHM	30 $\hbox{$.\mkern-4mu^\prime$ }$ 0	35 $\hbox{$.\mkern-4mu^\prime$ }$ 7
Mounting	equatorial	alt-az
Declination range	< $-25\hbox{$^\circ$ }$	> $-30\hbox{$^\circ$ }$
System temperature	$\sim$ 35 K	$\sim$ 35 K
Front end	HEMT He-cooled	FET He-cooled
rms noise	$\sim$ 0.07 K	$\sim$ 0.09 K
Back end	1008 channel DAC	1024 channel DAC
Bandwidth	5 MHz	5 MHz
Velocity coverage	-450 to +450 km s^-1	-450 to +400 km s^-1
Velocity resolution	1.27 km s^-1	1.25 km s^-1
Channel separation	1.05 km s^-1	1.03 km s^-1
IAU standard regions	S9	S8 and S7
Observing dates	1994 to 2000	1989 to 1993
Number of spectra	50 980	138 830
Grid in l, b	$0\hbox{$.\!\!^\circ$ }5$ /cos(b), $0\hbox{$.\!\!^\circ$ }5$	$0\hbox{$.\!\!^\circ$ }5$ /cos(b), $0\hbox{$.\!\!^\circ$ }5$

Source LaTeX | All tables | In the text

	1 Introduction
	2 Parameters of the all-sky LAB survey merging the LDS and IAR data
	3 Data reduction and calibration
	4 Availability of the LAB survey in digital form
	5 Sample maps displaying the LAB survey
	References