Color–magnitude diagrams for the measured starlike objects around UGC 9799, for the ACS/WFC field (left panel) and the outlying WFC3/WFC field (right panel). Here the native filter magnitudes ﹩F475W,F814W﹩ are plotted, closely equivalent to I vs. ﹩(g^{\prime} -I)﹩ in the VEGAMAG system. These values are not corrected for reddening. For the WFC3 field, objects with ﹩y\lt 95^{\prime\prime} ﹩ are plotted to avoid contamination from another galaxy (see text). Detection completeness levels of f = 0.5 are marked with the red dashed lines, and the photometric measurement uncertainties are indicated by the error bars at left.