r0 vs. (r−i)0 diagram of the faint M-type population (upper panel). Black dots show those selected as MS foreground field stars (see text). The solid lines show the 0.5, 5.0, 10.0 Myr and the 1 Gyr isochrones at the cluster distance. Dotted and dashed lines represent the 1 Gyr isocrone at 300 and 400 pc, respectively. Spatial distribution (middle panel) and ⟨AV⟩MS (bottom panel) of the selected MS foreground field stars. The median and the median ± pseudo-σ of this distribution are indicated as the solid and dashed lines.
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