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Fig. 4

image

Observed number counts of PN as function of magnitude (top panel) and detection completeness of a simulated PN population (bottom panel). The dashed horizontal line denotes the 50% recovery limit that results in the limiting magnitude m5007,lim,cat = 29.3 indicated by the dashed vertical line. The solid vertical line denotes the conservative limiting magnitude m5007,lim = 28.8 based on the decrease of the observed PN-number counts.

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