Fig. 1
a) The (r − i), r color−magnitude diagram of a region of 
radius centered on the ONC. The arrow represents a reddening vector for Av = 1.8 (typical for Orion; Schlafly et al. 2014) and extinction curve with Rv = 3.1 (Cardelli et al. 1989). The photometric errors (magnitudes and colors) are indicated by black crosses; b) the same CMD shown in a) after unsharp masking.
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