Reproduction of the ChMs from Figure 5, with bright MS stars (17.6 < m_F277W < 18.6) in the top panel and M dwarfs (19.8 < m_F277W < 21.7) in the bottom panel. LS and US stars are shown in red and blue, respectively. The black dashed line separates the selected US and LS populations. The dashed-dotted and solid gray lines mark the boundaries between the upper and middle streams, and between metal-rich and metal-poor stars, respectively. The gray dots represent the simulated ChMs for a simple stellar population, and are shifted to the left for clarity.