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Table A.1
Field description for the singleband photometric catalogs.
Field name  Format  Units  Description 


Source identification and position information  


DESIGNATION  A25  −  Designation of the source based on its Galactic position in the form LLL.llll±b.bbbb. The naming convention for the HiGAL catalogue has the form HIGALPXLLL.llll±b.bbbb, where HIGALP stands for the preliminary catalogue, X stands for the band where the source has been identified among the possible choices: B – blue band; R – red band; S – PSW band; M – PMW band; L – PLW band. 
GLON  F12.6  degrees  Galactic longitude of the source. 
GLAT  F12.6  degrees  Galactic latitude of the source. 
DGLON  F5.2  arcsec  Uncertainty in the Galactic longitude coordinate derived from the fitting procedure. 0 indicates that the fitting process hit the boundary limits imposed on the fit. 
DGLAT  F5.2  arcsec  Uncertainty in the Galactic latitude coordinate derived from the fitting procedure. 0 indicates that the fitting process hit the boundary limits imposed on the fit. 
RA  F12.6  degrees  J2000 Right Ascension of the source. 
DEC  F12.6  degrees  J2000 Declination of the source. 
ATLAS_IMAGE  A40  −  Atlas image file identifier from which the source was extracted. 
X  F9.3  pixel  xpixel coordinate of this source in the original image. 
Y  F9.3  pixel  ypixel coordinate of this source in the original image. 
DX  F9.3  pixel  Uncertainty in the x coordinate of this source derived from the fitting procedure. 
DY  F9.3  pixel  Uncertainty in the y coordinate of this source derived from the fitting procedure. 
SOURCE_ID  A10  −  Unique source identification in the form lLLL NNNN, where lLLL is a unique identifier of the original image over which source extraction was carried out, and NNNN is a progressive fourdigit, zerofilled number indicating the sequential order of extraction. 


Primary photometric information  


FINT_UNCORR  F15.3  Jy  Sourceintegrated flux measured from the fitting process. 
FINT  F15.3  Jy  Sourceintegrated flux measured from the fitting process after applying photometric corrections as a function of the source size, to account for source nonGaussianity and for scan speed. 
ERR_FINT  F15.3  Jy  Uncertainty on the integrated flux computed by multiplicating the fitted source residual rms (RMS_TOTAL) by the fitted source area as estimated by FWHMA and FWHMB. 
FPEAK  F15.3  MJy/sr  Source peak flux measured from the fitting process. 
FWHMA  F10.2  arcsec  Full width at half maximum of the source along axis a of the elliptical Gaussian as determined by fitting engine. 
FWHMB  F10.2  arcsec  Full width at half maximum of the source along axis b of the elliptical Gaussian as determined by fitting engine. 
PA  F6.1  degrees  Position angle of the elliptical Gaussian (N→E). 
BACKGROUND  F15.3  MJy/sr  Background value determined at the source peak position. 
BACK_ACOEFF  F12.5  MJy/sr  Coefficient a of the zeroorder term of the background obtained by the fit at the source peak position. 
BACK_BCOEFF  F12.5  MJy/sr/pxl  Coefficient b of the firstorder term x of the background obtained by the fit at the source peak position. 
BACK_CCOEFF  F12.5  MJy/sr/pxl  Coefficient c of the firstorder term y of the background obtained by the fit at the source peak position. 
BACK_DCOEFF  F12.5  MJy/sr/pxl^{2}  Coefficient d of the secondorder term x^{2} of the background obtained by the fit at the source peak position. 
BACK_ECOEFF  F12.5  MJy/sr/pxl^{2}  Coefficient e of the secondorder term y^{2} of the background obtained by the fit at the source peak position. 
BACK_FCOEFF  F12.5  MJy/sr/pxl^{2}  Coefficient f of the secondorder term xy of the background obtained by the fit at the source peak position. 
RMS_TOTAL  F12.5  MJy/sr  Standard deviation, σ_{loc}, of the residuals computed within the source area defined by FWHMA and FWHMB after subtracting the best fit. 
RMS_SURROUND  F12.5  MJy/sr  Standard deviation, σ_{loc}, of the residuals computed within the fitting window after subtracting the best fit, excluding both the pixels that belong to the source and the pixels belonging to other sources that fall within the fitting window. 
SNR  F12.5  −  Signaltonoise ratio obtained by dividing FPEAK by the residual rms over a source area with FWHMA and FWHMB as semiaxes. 


Basic detection information  


DET_X  F10.3  −  Relevance of the source in the secondderivative map along the xaxis defined as the ratio between the measured second derivative at source peak position and the adopted local threshold value. 
DET_Y  F10.3  −  Relevance of the source in the secondderivative map along the yaxis defined as the ratio between the measured second derivative at source peak position and the adopted local threshold value. 
DET_X45  F10.3  −  Relevance of the source in the secondderivative map along the bisector of the xyaxis defined as the ratio between the measured second derivative at source peak position and the adopted local threshold value. 
DET_Y45  F10.3  −  Relevance of the source in the secondderivative map along the bisector of the yxaxis defined as the ratio between the measured second derivative at source peak position and the adopted local threshold value. 
DETLIM_X  F10.3  MJy/sr/pxl^{2}  Absolute value for the local detection limit threshold adopted for the second derivative along the xaxis coordinate. 
DETLIM_Y  F10.3  MJy/sr/pxl^{2}  Absolute value for the local detection limit threshold adopted for the second derivative along the yaxis coordinate. 
DETLIM_X45  F10.3  MJy/sr/pxl^{2}  Absolute value for the local detection limit threshold adopted for the second derivative along the bisector of the first and third quadrant. 
DETLIM_Y45  F10.3  MJy/sr/pxl^{2}  Absolute value for the local detection limit threshold adopted for the second derivative along the bisector of the second and fourth quadrant. 
CLUMP_FLAG  I5  −  Flag for confusion at detection level. A value equal to 0 means that the source was identified from an isolated group of pixels above the threshold in all the four derivative directions. Sources belonging to the extraction of the same atlas image having the same value of this flag belong to the same group of pixels above the threshold. 
NCOMP  I2  −  Number of Gaussian components used simultaneously in the fitting process. This number includes the source, so the minimum value is 1, this number is greater than 1 if the source is fit with other nearby detections. 
XCENT  F9.1  pxl  The xpixel coordinate of the centre of the source fitting window in the original image. 
YCENT  F9.1  pxl  The ypixel coordinate of the centre of the source fitting window in the original image. 
XWINDOW  I2  pxl  Halfwidth size of the source fitting window along x coordinate and centred at XCENT. 
YWINDOW  I2  pxl  Halfwidth size of the source fitting window along y coordinate and centred at YCENT. 
NCONTAM  I2  −  Number of other sources falling inside the fitting window whose presence is taken into account at fitting stage. Not all those other sources might have been fitted at the same time. 
CENT_TOL  F5.2  pxl  Maximum variation in pixels for adjustment of the fit centre with respect to the position of detection, measured as the distance between the latter and the brightest local (within three pixels) pixel in the fitting window. 
DOF  I4  −  Degrees of freedom of the source Gaussian fit. 


Quality flags  


CHI2  F12.5  −  χ^{2} determined by the fitting engine. 
CHI2_OPP  F12.5  −  Estimator of the fidelity between the fit and the data computed as φ = (O(i)−F(i))^{2}/F(i), where O(i) is the observed data in the i pixel of the fitting window and F(i) is the fitted value in the same position. 
FIT_STATUS  I1  −  Flag returned from the fitting engine. Possible values of the flag are: 0 – fit convergence failed; 1 – convergence reached; 2 – convergence reached despite the initial accuracy requested to fitting engine was set too low; 3 – maximum number of iterations in the fitting process reached; 4 – problems in fitting due to the initial guess. 
GUESS_FLAG  A3  −  Flag on quality of guessed source parameters as determined at the detection stage. The form of the flag is GN, where G is a letter defined as A – optimal number of positions to estimate the size; B – sufficient number of positions to estimate the size; C – low number of positions to estimate the size; and N is a number defining the quality of inital guess size: 0 – initial estimate failed; 1 – good initial estimate for sizes; 2 – one of the two guessed sizes was initially estimate as smaller than the PSF; 3 – initial estimates of source sizes were higher than three times the PSF. 
GROUP_FLAG  I5  −  Flag on quality of guessed source parameters as determined at the detection stage. The form of the flag is GN, where G is a letter defined as A – optimal number of positions to estimate the size; B – sufficient number of positions to estimate the size; C – low number of positions to estimate the size; and N is a number defining the quality of initial guess size: 0 – initial estimate failed; 1 – good initial estimate for sizes; 2 – one of the two guessed sizes was initially estimated as smaller than the PSF; 3 – initial estimates of source sizes were higher than three times the PSF. 
CONSTRAINTS  I1  −  Flag indicating the number of parameters that reached the tolerance limits allowed to the fit process. Values of 4 indicate that the source flux has higher unreliability since either the centre and its sizes have reached the maximum (or the minimum) allowed for the fit engine. 
SHIFT_FLAG  F9.3  arcsec  Amount of shift of the source peak position from its original detection position, due to Gaussian fitting. 
Basic extraction information  


RDETP2DX  F9.3  −  Ratio between the secondderivative value along x direction expected by the fitted model of the source and the second derivative derivative measured at the detection stage. Values closer to one indicate a higher reliability of the source. 
RDETP2DY  F9.3  −  Ratio between the secondderivative value along y direction expected by the fitted model of the source and the second derivative measured at the detection stage. Values closer to one indicate a higher reliability of the source. 
RDETP2DX45  F9.3  −  Ratio between the secondderivative value along the bisector of the xy direction expected by the fitted model of the source and the second derivative measured at the detection stage. Values closer to onea indicate a higher reliability of the source. 
RDETP2DY45  F9.3  −  Ratio between the secondderivative value along the bisector of the yx direction expected by the fitted model of the source and the second derivative measured at the detection stage. Values closer to one indicate a higher reliability of the source. 
OVERLAP_FLAG  F9.3  −  Flag to indicate whether the source has been detected and extracted in one or more adjacent tiles. H indicates that the source has been detected in the tile named in column ATLAS_IMAGE; E,W indicate that the source is detected only in the eastern or western adjacent tile, respectively (east is higher Galactic longitude); if the source has been detected in both H and E or W, then the name of the adjacent tile is also listed (e.g. H_l060). In these cases, the entry in the catalogue is the one with the highest S/N. 
OVFLUX_FLAG  I  −  Flag to indicate which flux values were adopted if detected and extracted in two adjacent tiles. 0 indicates that the source has been detected only once and therefore all fluxes refer to this detection. –1 indicates that the two fluxes differ by more than 15%; the one listed is that with the highest S/N. 1 indicates that both integrated fluxes lie within 15%, the one in the catalogue is that with the highest S/N. 2 indicates that the integrated fluxes differ by more than 15% but FPEAK are within 15%; the one listed is that with the highest S/N. 
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