Temperature-weighted gravity vs. ﹩{M}_{K{\rm{s}}}﹩ for test stars with emission lines. The temperature-weighted gravity of a star is an indicator of its bolometric luminosity. Spectroscopic ﹩{M}_{K{\rm{s}}}﹩ measurements are shown with dot symbols while geometric ﹩{M}_{K{\rm{s}}}﹩ are shown with star symbols. The solid line indicates the best-fit linear relation from the sample of nonemission stars.