Effect of the offset between X-ray and optical centres on the velocity dispersion – richness scaling relation for the SCGF Gaussian subsample. The parameters of the scaling relations for the small offset clusters are shown using solid blue lines and for the large offset clusters – with dash-dotted magenta lines. The separation is done at 0.3 R_200c. For reference, we also present the parameters describing the scaling relations for the full sample (all clusters) with solid black lines. Other details are the same as in Fig. 12.