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# xCOLD GASS Data Release: Catalog description
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# Identifiers and basic properties 
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   ID			LONG		GASS catalog ID
   SDSS			STRING	SDSS name
   OBJID		LONG64	SDSS ObjID
   SPECOBJID		LONG64	SDSS SpecObjID
   PLATEID		INT		SDSS spectroscopic Plate ID
   MJD 			LONG		SDSS spectroscopic MJD ID
   FIBERID		INT		SDSS spectroscopic Fiber ID
   RA 			DOUBLE	RA from SDSS, J2000 [decimal degrees]
   DEC			DOUBLE	Dec from SDSS, J2000 [decimal degrees]
   Z_SDSS		FLOAT		SDSS spectroscopic redshift
   LUMDIST		FLOAT		Luminosity distance [Mpc] 
					(Omega_m=0.3, Omega_L = 0.7, H0 = 70 km/s/Mpc)
   INCL            		FLOAT		Disc inclination [degrees]
   NUVR	       	FLOAT		NUV-r colour, corrected for Galactic extinction
   R50KPC          	FLOAT		SDSS r-band Petrosian R50[kpc]
   LOGMSTAR        	FLOAT    	Stellar mass [log Msun]
   LOGMUST         	FLOAT		Stellar mass surface density [log Msun/kpc^2]
					(calculated as log(mu*)=log(M*/(2*pi*r50_z^2)) )
   CINDX           		FLOAT     	Concentration index (ratio of r-band Petrosian R90 and R50)
   WEIGHT          	FLOAT    	Statistical weight
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# Star formation rates and IR luminosity  
# note:  All the SFRs are given in units of log(Msun/yr) and for a Chabrier IMF 
#          We recommend the use of LOGSFR_BEST
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   LOGSFR_MPAJHU	FLOAT		SFR from SDSS MPA/JHU catalog
   LOGSFR_SED	FLOAT        	SFR from UV+optical SED fitting 
   LOGSFR_BEST 	FLOAT		SFR from WISE + GALEX when detected in both data sets
						else from SED fitting (see Janowiecki et al. 2017) 
   LOGSFR_ERR	FLOAT		Error on LOGSFR_BEST
   FLAG_IRAS       	INT 		Detection flag in the IRAS PSC, 1:yes, 2:no
   LOGLIR_IRAS            FLOAT		Total IR luminosity [log Lsun]
   IRCOL_IRAS         	FLOAT     	IRAS colour (F60/F100)
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# Spectral information  
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   N2HA			FLOAT		log(FLUX_NII_6583/FLUX_Halpha_6562) 
					(using fluxes from SDSS DR7)
   O3HB 		FLOAT         	log(FLUX_OIII_5006/FLUX_HBeta_4861)
					(using fluxes from SDSS DR7)
   AGNCLASS		INT		BPT-based AGN classification, -1:undetermined, 0:inactive, 
					1:SFing, 2:Composite, 3:AGN, 4:Seyfert		
   Z_PP04_N2 		FLOAT		12+logO/H from N2Ha using Pettini&Pagel (2004)
   Z_PP04_O3N2  	FLOAT		12+logO/H from N2Ha and O3Hb using Pettini&Pagel (2004)
   Z_MZR		FLOAT		12+logO/H from MZR, Kewley&Ellison08, PP04 calibration
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# IRAM Observations  
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   FLAG_CO         	INT		CO(1-0) detection flag, 1:yes, 2:no
   XCO             		FLOAT		Constant Galactic CO-to-H2 conversion factor except for galaxies suspected of requiring the lower “merger” value
   XCO_A17         	FLOAT		CO-to-H2 conversion function from Accurso et al. (2017)	
   XCO_A17_ERR     	FLOAT     	Error on XCO_A17
   ICO             		FLOAT     	CO(1-0) line flux [K km/s]
   ICO_ERR         	FLOAT		Error on ICO [K km/s]
   ICO_COR         	FLOAT		CO(1-0) line flux, aperture corrected [K km/s]
   ICO_COR_ERR     	FLOAT		Error on ICO_COR [K km/s]
   LCO             		FLOAT		CO(1-0) line luminosity [K km/s pc^2]
					(if FLAG_CO=2, then this is a 3sigma upper limit)
   LCO_ERR         	FLOAT		Error on LCO [K km/s pc^2]
   LCO_COR         	FLOAT		CO(1-0) line luminosity, aperture corrected [K km/s pc^2]
					(if FLAG_CO=2, then this is a 3sigma upper limit)
   LCO_COR_ERR 	FLOAT		Error on LCO_COR [K km/s pc^2] 
   RMS_CO          	FLOAT		Rms noise around the CO(1-0) line in 20km/s-wide channels [K]
   SN_CO           	FLOAT     	Integrated S/N of the CO(1-0) line 
   WCO             		FLOAT		FWHM of the CO(1- 0) line [km/s]
   WCO_FLAG        	INT		Quality flag for WCO, 1:high quality, 2: acceptable, 3: poor 
   Z_CO            		FLOAT		Redshift based on the velocity of the CO(1-0) line
   WCO_TFR         	FLOAT		FWHM of the CO(1-0) for TFR work from Tiley et al. (2016) [km/s]
   WCO_TFR_ERR     	FLOAT 		Error on WCO_TFR
   LOGMH2          	FLOAT    	Total molecular gas mass [log Msun]
   LOGMH2_ERR      	FLOAT		Error on LOGMH2
   LIMLOGMH2       	FLOAT    	3sigma upper limit for LOGMH2, if FLAG_CO=2
   LOGMH2MS        	FLOAT    	Molecular gas mass fraction [log MH2/M*]
   FLAG_CO21       	INT		CO(2-1) detection flag, 1:yes, 2:no, 0:not observed
   ICO21           		FLOAT 		CO(2-1) line flux [K km/s]
   ICO21_ERR       	FLOAT     	Error on ICO21 [K km/s]
   LCO21           		FLOAT		CO(2-1) line luminosity [K km/s pc^2]
					(if FLAG_CO21=2, then this is a 3sigma upper limit)		
   LCO21_ERR       	FLOAT    	Error on LCO21 [K km/s pc^2]
   RMS_CO21        	FLOAT     	Rms noise around the CO(2-1) line in 20km/s-wide channels [K]
   SN_CO21         	FLOAT		Integrated S/N of the CO(2-1) line
   WCO21           	FLOAT		FWHM of the CO(2-1) line [km/s]
   WCO21_FLAG      	INT		Quality flag for WCO21, 1:high quality, 2: acceptable, 3: poor
   Z_CO21          	FLOAT		Redshift based on the velocity of the CO(2-1) line
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# APEX CO(2-1) Observations  
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   FLAG_APEX       	INT       		CO(2-1) detection flag, 1:yes, 2:no, 0:not observed
   ICO_APEX        	FLOAT		CO(2-1) line flux [K km/s]
   LCO_APEX        	FLOAT		CO(2-1) line luminosity [K km/s pc^2]
   RMS_APEX        	FLOAT		Rms noise around the CO(2-1) line in 20km/s-wide channels [K]
   SN_APEX         	FLOAT    	Integrated S/N of the CO(2-1) line
   WCO_APEX        	FLOAT    	FWHM of the CO(2-1) line [km/s]
   ZCO_APEX        	FLOAT		Redshift based on the velocity of the CO(2-1) line