Illustration of the metallicity-dependence of the evolved CMD regions, analogous to the top-left panel of Figure 3. From left to right, the panels show suites of PARSEC models at [M/H]=−0.3, 0, and +0.3 dex. The colors indicate the evolutionary stage for each metallicity bin. The borders used in the CMD classification of Sect. 3, calculated at [M/H]=0 dex, are shown as the thick grey lines in all panels.