Histogram for the identified member stars in our sample GCs and OCs (see Sect. 2.1 for details). The distribution for GCs is shown as a dash-dotted red line, for OCs as a dashed blue line, and for the composite sample (GCs+OCs) as a solid green line. The dotted vertical red line with arrows pointing to the right denotes the minimum number of member stars for GCs, and the dotted vertical blue line with arrows pointing to the left indicates the maximum number of identified member stars in OCs.