Projected phase-space and velocity histogram of the stack of all ITP clusters members (top) and all SDSS cluster members (bottom). In both cases, velocities are normalised to the cluster velocity dispersion. The dashed black lines indicate the 2.5 − σ clipping, and the dotted blue lines show the same clipping, but take the velocity dispersion radial profile as shown in Łokas & Mamon (2001) into account. The red line in the right panel represents a Gaussian fit of the stacked velocity histogram normalised to the total number of members.