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Fig. 3

image

Constant low-luminosity model (Model1). Left: density and dust temperature profiles of IRAM 04191 as presented in Belloche et al. (2002) (temperature: brown, density: dashed dark blue) and as self-consistently computed with the transphere code for an internal luminosity of 0.08 L (temperature: red, density: light blue). Right: chemical abundances of C18O (red) and N2H+ (blue, upscaled by a factor 100) at a chemical age of ~104 yr.

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