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Fig. 1

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Scheme of the method for deriving physical parameters of star cluster. Panel a) shows the grid of models (only age and mass are displayed; same for extinction). These models are represented in the photometric space (only MU and MB are shown) displayed in panel b); only 100 models per node without extinction are shown). In panel c) all the models situated within 3–σ (circle) from the observed absolute magnitudes are selected. Panel d) shows the nodes associated with these models. The 1D age and mass distributions of the selected models are displayed as normalized histograms in panels e) and f), used to determine most probable values, indicated by solid vertical lines; confidence intervals are indicated by dashed lines.

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