Color−magnitude diagram (CMD) for M 83 based on Spitzer IRAC Bands 1 and 2 photometry. Regions empirically known to contain red supergiants (RSGs) and supergiant Be stars (sgB[e]) in Bonanos et al. (2009, 2010) are outlined with red and blue boxes, respectively. Objects that lie within those regions are plotted with red and blue points. On the left side of the plot are shown the average 1σ uncertainty ellipses for stars in 1 mag bins for the [3.6] photometry and the [3.6]–[4.5] color. For reference, also plotted are the locations of the prominent evolved massive stars η Car (Humphreys & Davidson 1994), M 33 Variable A (Humphreys et al. 2006), and Object X (Khan et al. 2010) when placed at the distance (~4.8 Mpc) of M 83.