Fig. 3
Line-strength ratio of the H2O JKa,Kc = 21,2−10,1 transition and the CO J = 15−14 transition as a function of the pulsational period. The points with error bars give the measured H2O/CO line-strength ratios, color coded according to the value of the wind density proxy Ṁg/ ν∞,g in units of M⊙ yr-1 km-1 s (see legend). A black cross superimposed on the data point indicates that the H2O line is flagged as a blend.
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