Fig. A.3
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Gaia BP/RP spectra of well-known RSGs in the catalog of Messineo & Brown (2019). The vertical orange dotted-dashed lines mark the locations of the main absorption bands seen in M1-M3 RSGs and O-rich stars. For comparison, the centroids of the absorption seen in S-type (red) and C-rich stars (blue) are also shown (see also https://mariamessineo.github.io/KMclassI-DR3_AB_BP-RPspectra/).
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