Color–magnitude diagram of stars with K< 8 in the field of 1° radius around l = 79°8, b = + 0°8. The filled circles are the candidate M supergiants selected for spectroscopic observations and, except for the brightest of them, the photometry has been obtained by us as described in Sect. 3.1. Photometry for the remaining stars has been taken from the 2MASS Point Source Catalog.
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