Fig. 4
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HRD of our the sample. The size of the markers is proportional to the dust shell masses as shown in the bottom right legend. The marker’s colour represents the variability type. Red: semi-regulars (SRs), green: irregulars (LB), and blue: Miras (M). The shape of the markers represents the chemistry of the AGB stars. Circles: O-rich (‘naked’ as asterisks), crosses: C-rich.
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