Fig. 6.
Upper panel: theoretical relationship between central degeneracy parameter and total stellar mass around M = 0.2 M⊙ for 10 Gyr BaSTI-IAC models with [Fe/H] = 0.06. Middle panel: same as the upper panel, but for the central temperature. Lower panel: same as the upper panel, but for the surface luminosity. Data from M15 are also displayed (see text for details).
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