Fig. 7
Mass-loss rates as a function of IR colours. Symbols are the same as in Fig. 5. The grey open histogram shows the colour distribution of dust-free AGB stars; the red histogram is the distribution of C-stars alone. The solid line is the best fit to all C-stars, including the Groenewegen et al. (2009) data. The dashed line in the upper panel is the relation of Matsuura et al. (2009).
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