PNLF of the completeness-corrected PN sample in two radial bins. Left panel: PN sample in the inner halo (r^{1 / 4}< 5.25); right panel: sample in the outer halo (r^{1 / 4} ≥ 5.25). The error bars along the y-axis account for the Poissonian error and the x-errors for the bin width. The solid lines show the fits to the PNLF allowing for variation in the parameter c₂ while the dashed lines show the fits with a fixed c₂ = 0.307 (Ciardullo et al. 1989). As in Fig. 10, the grey region denotes the magnitude range in which the PNLF might be affected by incompleteness.