a) Same as Fig. 13, but for features born by appearance for area-ratio criterion 10:1 (solid line, averaged over 2116 features) and 2:1 (dotted line, averaged over 2425 features). b) Same as a) for features born by emergence (averaged over 64 and 25 features for 10:1 and 2:1 respectively). c) Same as a) for features born by splitting (averaged over 791 and 375 features for 10:1 and 2:1 respectively). d) Same as a) for features born by merging (averaged over 631 and 413 features for 10:1 and 2:1 respectively).