Upper panel: HR diagram of the stellar sample segregated by Galactic direction (center/anticenter). Blue and red dots represent stars in the LRc01 and LRa01 fields, respectively. Evolutionary tracks for Z = 0.019, from Girardi et al. (2000), are shown for stellar masses between 0.8 and 5 M⊙. Lower panel: HR diagram of the stellar sample segregated by the iron abundance [Fe/H]. Green, black, and red points represent stars with [Fe/H]≤ − 0.25, −0.25<[Fe/H]≤ + 0.25 and [Fe/H]≥ + 0.25, respectively. Evolutionary tracks for Z = 0.004, Z = 0.019, and Z = 0.030, from Girardi et al. (2000), are presented with lines in green, black, and red, respectively. In this panel, only the following stellar mass values are represented: 0.8 M⊙ (dot lines), 1.0 M⊙ (solid lines) and 2.0 M⊙ (dash lines). For clarity, in both panels we plot only the evolutionary tracks until the RGB stage.
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