**Table 2:** The SDSS DR5 main samples used, and the FoF parameters for the group catalogue (DR4 is for comparison, but not used).
Sample	RA, $\lambda$	Dec, $\eta$	$N_{\rm gal}$	$N_{\rm groups}$	$N_{\rm single}$	$LL_{\rm r0}$	$LL_{\rm p0}$	z_*	a
	deg	deg				km s^-1	Mpc/h
1	2	3	4	5	6	7	8	9	10
SDSS DR4 E	120...255	-1...16	116 471	16 244	65 016	250	0.25	0.138	1.46
SDSS DR4 N	-63...+63	6...39	197481	25 987	115 488	250	0.25	0.138	1.46
SDSS DR5 E	120...255	-1...16	129 985	17 143	75 788	250	0.25	0.055	0.83
SDSS DR5 N	-63...+63	6...39	257 078	33 219	152 234	250	0.25	0.055	0.83

Columns: 1: Subsample of the SDSS redshift catalogue, 2: right ascension limits for the equatorial (E) sample, $\lambda$ coordinate limits for the northern (N) sample (degrees), 3: declination limits for the E sample, $\eta$ coordinate limits for the N sample (degrees), 4: number of galaxies in a subsample, 5: number of groups in a subsample, 6: number of single galaxies, 7: FoF linking length in radial velocity, for z=0, 8: FoF linking length in the projected distance in the sky, for z=0, 9: characteristic scaling distance for the linking length, see Eq. (1), Sect. 5, 10: scaling amplitude for the linking length, see Eq. (1), Sect. 5.

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