Fig. 4

Synthetic CMD in the absolute V band for a population of 100 Myr with Y = 0.25 (left panel) and Y = 0.35 (right panel). The green triangles represent the Cepheids. The FRE (red line), FORE (dashed red line), FBE (blue line) and the FOBE (dashed blue line) are also shown. In these plots the photometric uncertainties are neglected.
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