Fig. 13
Models with r1/2 = 0.4, β = 5.0, and Ṁ= 1.3 × 10-7M⊙ yr-1 compared to the 13CO observed lines. The solid red line represents the observations. The long-dashed green, short-dashed blue, dotted pink, and dot-dashed light blue lines represent models with 12C/13C = 10, 15, 20, and 30, respectively. A value of 18 for the 12C/13C ratio reproduces the data best.
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