Fig. 1
CMDs of Pismis 12, IC 1434, Juchert 10, and Ru 30, for a representative cluster region (top panels) and the equal-area comparison field (middle). The decontaminated CMDs (bottom) are shown together with the isochrone solution (solid line) and the colour-magnitude filter (shaded polygon). Note that, for most stars, the error bars are smaller than the symbol.
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