Dust-to-gas ratio (DGR) in the circumstellar shell at the end of M-star evolution for Z = 0.008 and 0.02 (line with open circles and diamonds, respectively), and at the end of C-star evolution for metallicities Z = 0.001, 0.004, 0.008 (lines with filled circles, squares, and triangles, respectively) from calculations by Ferrarotti & Gail (2006) and Zhukovska et al. (2008).
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