Number of objects relative to the reference number of structures with respect to the peak threshold (top) and the peak-to-saddle ratio (bottom). The reference values are given by the dashed vertical black lines. The dotted red line gives the number of structures extracted at a given parameter value relative to the number of objects from the reference extraction. The dashed horizontal gray line shows N = N_ref. The dotted blue and green lines show the number of local density maxima (before sorting) and density peaks (after sorting), respectively, relative to the reference number of extracted structures. The colored lines and intervals correspond to the mean and standard deviation over three snapshots.