Fig. 1.
Comparison between the HIPPARCOS and Gaia distances derived from parallax measurements (see Table 1) for the 49 SRs in our sample. Circles, squares, and triangles are O-rich, C-rich, and S-type stars, respectively. Blue, brown, red, and green colors are type 1, 2, 3, and 4 profiles, respectively (see Sect. 3.1). The dashed line marks the 1:1 relationship.
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