Same image as in the bottom panel of Fig. 1, showing examples of CMD in three different 50″ × 50″ regions. In all insets, the visually selected bluer and redder ends of each RC are shown as vertical blue and dashed red lines, respectively. The left inset shows a thin well-defined RGB with a prominent RC in H-K ~ 1. The middle inset shows two RC features: one feature with a low extinction at H-K ~ 1, and another feature with a high extinction centered at H-K ~ 2. Between these two RCs, there is a gap without stars. The right inset shows a spread RC.