Spatial distribution of the M supergiants discussed in this study (filled circles). Other symbols represent stars from the survey of Comerón & Pasquali (2012), which correspond to O-type stars (asterisks), main sequence B stars (crosses) and B-type giants and supergiants (open circles). The dashed line delimits the boundary of Cygnus OB2 as adopted by Comerón & Pasquali (2012) and is the area where we have searched for M supergiant candidates. For reference, the area studied in detail by Wright et al. (2015) is indicated by the smaller, dotted circle.
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