CMD of sources extracted by DOLPHOT. Left: All photometric sources are shown in gray, with those passing the data quality cuts highlighted in black. Middle: Sources passing the quality cuts, overplotted with a synthetic foreground stellar population from TRILEGAL (blue) and synthesized photometry of background galaxies from the HUDF based on SED models (red), scaled by area to match the field-of-view of our observations. Right: The final selection of Boo I member stars in black, with likely foreground stars in blue and likely background galaxies in red based on color and magnitude cuts. The Boo I member giants, which we also exclude in our analysis, are plotted in green.