Photometric diagrams to distinguish AGBs and RSGs. Left pαnel: M_K values versus colors. Gray-filled circles mark class I stars from areas A and B of Messineo & Brown (2019). Black-filled circles indicate the newly Apsis selected bright late-type stars, in magenta those reported in the literature as S-type stars, and in cyan those reported as C-rich stars. The long-dashed line separated the bulk of AGB stars from the sequence of known RSGs (Messineo & Brown 2019), which lies in a vertical sequence between color 0 and 1 mag. The C-rich stars are redder than the roughly traced cyan-dotted curve (Abia et al. 2022). Right pαnel: versus WISE [W3–W4] colors. Symbols are the same as in the left panel.