Top: luminosity function of the M 87 halo PNs (red circles) together with the fit of the generalised analytic formula to the halo PNLF, with c₂ = 0.72 and bright cut-off at magnitude 26.3. After the statistical subtraction of the reassessed ICL component no residual of a dip is seen. Bottom: PNLF for the ICPNs (blue circles). The blue line shows the fit of the generalised analytic formula to the ICPNLF, with c₂ = 0.66 and bright cut-off magnitude at 26.3. The statistical significance of the dip at 1−1.5 mag fainter than the bright cut-off is enhanced compared to Longobardi et al. (2015a).