Data from PSF photometry. Left: Y vs. (Z − Y) CMD of one chip of the tile b305 centered at (l,b) = −0.6, −1.9 showing no double clump at more optical wavelengths due to extinction. Middle: K_s vs. (J − K_s) CMD for the same stars showing the double clump due to extinction. This is the observed CMD, it is not dereddened. Right: (Z − Y) vs. (J − K_s) color−color diagram for stars with clump giant magnitudes 13.0 <K_s< 13.6. The reddening vector in each panel is associated with an extinction of E(B − V) = 1, based on the relative extinctions of the VISTA filters, and assuming the extinction law of Cardelli et al. (1989).