r−i vs. H−K diagram plotted as a two-dimensional stellar-density histogram using a binning of 0.01 × 0.01 and a seven-level color-coded scale such that high source densities (54 per bin) are dark green and the lowest densities (one per bin) are blue. The symbols are the same as in Fig. 5. The black and red solid lines are the 100 and 10 Myr PISA isochrones. The reddening vector is also shown.
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