Fig. 7
Line-strength ratio of two H2O transitions and the CO J = 15−14 transition as a function of Ṁg/ ν∞,g: the cold JKa,Kc = 21,2−10,1 line on the left, and the warm JKa,Kc = 33,0−22,1 line on the right. The points with error bars give the measured H2O/CO line-strength ratios, color coded according to the variability type: Miras in red, SR/Mira sources in blue, the SRa source in green, and SRb sources in black. A black cross superimposed on the data point indicates that the H2O line is flagged as a blend. The curves show the predicted H2O/CO line-strength ratios for various values of nH2O/nH2 as indicated in the figures. Adopted values for other parameters are listed in Table 4.
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