Correlation function along filaments for groups. The upper panel shows the correlation function for all groups and isolated galaxies together, the middle panel shows the correlation function only for groups with two or more members, and the bottom panel for groups with at least three member galaxies. The group richness (number of galaxies in a group) is taken from Tempel et al. (2014c). Blue lines show the correlation function for groups closer than 0.5 h^-1 Mpc to the filament axis and red lines show the correlation function for groups closer than 0.25 h^-1 Mpc. The shaded regions are the 95% confidence intervals. The insets show the width of the 95% confidence regions as a function of the pairwise distance.