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Table 1:

The SDSS DR7 Main DAS (March 2009) sample used and the FoF parameters for the flux- and volume-limited group catalogues.

Sample
$M_{\rm lim}$ $z_{\rm lim}$ $N_{\rm gal}$ $N_{\rm groups}$ $N_{\rm single}$ LLr0 LLp0 % in groups
              km  s-1 h-1 Mpc  
1 2 3 4 5 6 7 8 9 10

Flux-limited groups
                 
DR7 Main 17.77 0.009 0.2 583362 78800 314524 250-579 0.25-0.58 46.1
Volume-limited groups                  
DR7-18 -18.0 0.02595 0.04590 40 665 5463 24 248 250.0 0.2500 40.4
DR7-19 -19.0 0.02595 0.07141 94 912 12 590 58 733 306.7 0.3067 38.1
DR7-20 -20.0 0.02595 0.11012 148 195 18 973 96 842 409.4 0.4094 34.7
DR7-21 -21.0 0.02595 0.16801 103 978 9139 82 854 543.8 0.5438 20.3

Notes.  Columns: 1 - subsample name; 2 - galaxy magnitude limit in r-band (apparent for flux-limited groups, absolute for volume-limited groups); 3 - lower redshift limit; 4 - higher redshift limit; 5 - total number of galaxies $N_{\rm gal}$ in samples; 6 - number of groups in samples ($n \geq$ 2); 7 - number of single galaxies; 8 - FoF linking length in the radial velocity, for z=0; 9 - FoF linking length in the projected distance in the sky, for z=0; 10 - fraction of galaxies in groups ($n \geq$ 2).


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