Histograms of the LOSVD along the M 87 major (top four panels) and minor axis (bottom centre panel). The larger number of tracers associated with the M 87 halo allows us to divide the halo PN sample into northern (top left panels) and southern (top right panels) subsamples; moreover, the PN subsamples along the major axis are further divided in two elliptical bins, as given in the panels. The best-fit GM model (thick black line) identifies in all subsamples two Gaussian components (green lines). Dashed histograms represent the PN LOSVD prior to the statistical subtraction of the crown substructure.