D_nn,s distributions. (a) Distribution of D_nn,s for the 14 RSCGs in our sample. The outliers are RSCG 85 and RSCG 9, with D_nn,s = 250 scaled kpc and D_nn,s = 359 scaled kpc, respectively. The vertical dashed line represents the lower limit of D_nn,s for RSCG 64. (b) Distribution of D_nn,s for the 33 other RSCGs in the CfA2 survey with cz ≥ 2300 km s⁻¹. Twenty‐six have environment galaxies according to our criteria and are included in the histogram; seven have only upper limits, represented by the dashed lines A (four RSCGs in CfA2 North) and B (three RSCGs in CfA2 South).