Luminosity versus Teff diagram for the observed stars. Giants are plotted with blue triangles, subgiants with red squares, and late MS stars with green asterisks. Filled symbols indicate planet hosts. Some evolutionary tracks ranging from 0.7 to 3.0 solar masses from Girardi et al. (2000) are overplotted. For each mass, three tracks are plotted, corresponding to Z = 0.008 ([Fe/H] = −0.4 dex, dotted lines), Z = 0.019 ([Fe/H] = + 0.0 dex, solid lines), and Z = 0.030 ([Fe/H] = + 0.20 dex, dashed lines).
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