Fig. 6.
Mass-loss rate vs. 12CO(1-0)-to-12CO(2-1) intensity ratio in carbon-rich (left panel) and oxygen-rich (right panel) SRs, respectively. We note the moderate correlation between both parameters for O-rich SRs (r = 0.65 and RMSE = 0.44). Markers are as in Fig. 1. We excluded the only S-type star in the sample (AA Cyg). Upper limits are indicated with arrows.
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