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Fig. 1

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Overplotted models, showing for each parameter the effect of varying its value, while keeping all other parameters fixed at: Ti = 4500 K; p = −0.75; (NH)i = 8.3 × 1025 cm−2; q = −0.5; Ri = 1.6 R; i = 30º; υG = 1 km s−1. The models are all without inclusion of13 CO, except in the bottom panel, where the effect of adding 13CO in varying abundances is shown. The continuum and stellar parameters used for these models are those of B275. The “fixed” model is colored black on each plot and is a fit to the B275 spectrum.

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