Galaxy catalogs:

DESI_NGC_galaxy: galaxy catalog at NGC
DESI_SGC_galaxy: galaxy catalog at SGC

data format:

column 1: ra
column 2: dec
column 3: redshift
column 4: luminosity
column 5: z-band absolute magnitude
column 6: redshift error

----------------------------------------------

Group catalogs:

DESI_NGC_group: group catalog at NGC
DESI_SGC_group: group catalog at SGC

data format:

column 1: group ID
column 2: richness
column 3: ra
column 4: dec
column 5: redshift
column 6: log M_h/(M_sun/h)
column 7: L_group (10^10Lsun/h/h) 

----------------------------------------------

member galaxy files:

1. The galaxies are listed in `iDESI_?GC_1' with format:
     1. galaxy id; 
     2. group id; 
     3. brightest galaxy = 1; other galaxies in groups = 2 - z-band
     4. auxiliary ID, not used.
   
2. The group members are listed in `iDESI_?GC_2' with format:
     1. group id; 
     2. member galaxy id in the galaxy catalog