Fig. 3.
CMDs (left panel) and PM-VPDs (right panel) of the 664 likely cluster members (PRF ≥ 0.6) of NGC 2539 and field stars (PRF < 0.6). The symbols are the same as those in figure 2. (Color online)
CMDs (left panel) and PM-VPDs (right panel) of the 664 likely cluster members (PRF ≥ 0.6) of NGC 2539 and field stars (PRF < 0.6). The symbols are the same as those in figure 2. (Color online)
