Fig. B.2
(i,i−Ks) color–magnitude diagrams for all objects with 2MASS Ks and SDSS i-band photometry. Left: sources in a 3° radius region centered on the B0 Ib star, ϵ Orionis (the central star of Orion’s Belt). Right: sources in the CF. The green ellipse plotted in each panel indicates the approximate position of the sequence in the science field.
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