Fig. 2
Left panel: colour–magnitude diagram for NGC 2232. Symbols and colours are as in Fig. 1 with the bracketing isochrones having values of log t = 7.4 (leftmost) and log t = 7.7 (rightmost). Right panel: theoretical HRD for NGC 2232. Symbols are as in Fig. 1. Bracketing isochrones corresponding to log t = 7.5 (leftmost) and log t = 7.6 (rightmost) are shown. Evolution tracks (from bottom right and progressing to upper left corner) for 1.7,2.0,2.5,3.0,4.0,5.0,6.0, and 7.0 M⊙ stars are shown.
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