Fig. 3.
Colour-colour (left panel) and line index-index diagrams of star clusters in M31. The indices are defined as Havg = (HδF + HγF + Hβ)/3 and Mavg = (Fe5270 + Mgb)/2. Blue and green pluses are respectively young and old clusters classified by the random forest classifiers. Blue and green circles are the young and old clusters in the training sample.
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