Fig. 4
Surface density histograms versus color. Panel a) Surface density for sources within Rgal ≤ Rbg. Darker color refers to areas with smaller galactocentric radii. Panel b) same as left, but for background sources at Rgal>Rbg. For the sake of clarity, the dotted histogram shows the density histogram times a factor 10. Panel c) residual surface density, Σ(Rgal ≤ Rbg) − Σbg.
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