Sharpness parameter (top panel) as a function of observed H-band magnitude for the HAWK-I S Ori 73 pointing, S Ori 73 plotted as a red filled circle. Our criterion for distinguishing resolved from unresolved sources is indicated with vertical lines: object detections between the two vertical lines are supposed to be unresolved (e.g., point-like sources). The bottom panel illustrates the fraction of unresolved (solid line) and resolved (dashed line) sources per H-band magnitude bin.