Upper panel: RCG selection in a K vs. J − K color–magnitude diagram for the direction ℓ = 180°, b = 7°, mK,0 = 13.0, giving a maximum of counts within the RCG region at (J − K)0 = 0.81; the dashed rectangle represents the area where the RCGs are selected. Middle panel: proper motions of the selected RCG stars in the catalog PPMXL. Bottom panel: proper motion in the direction of Galactic longitude vs. color; the dashed line indicates the median of 20 points.
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