Luminosities versus T_eff values of the 20 new very probable RSGs (filled-black circles, encircled by red rings) which were found by analyzing stars with Apsis parameters. For comparison, the highly-probable RSGs among the class I stars listed by Messineo & Brown (2019) are also plotted with gray-filled circles. Tracks of rotating stars at solar metallicity from Ekström et al. (2012) are over-plotted; the black dotted–dashed curve marks a 7 M_⊙ track; the green long-dashed curve marks a 9 M_⊙ track; the black-dotted curve marks a 12 M_⊙ track; the green dotted-dashed curve shows a 15 M_⊙ track; the black long-dashed curve marks a 20 M_⊙ track; the top green-dotted line shows a 25 M_⊙ track. The horizontal magenta-dashed line indicates the AGB magnitude limit.