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Fig. 5


Line flux ratios of our fiducial model (BD) against that of a selection of observed discs around T Tauri and Herbig objects (Obs), our T Tauri model (TT), and our models with large chemical networks (BD_LU and TT_LU). The 13CO J = 3−2 to HCO+J = 4−3 ratio data are from Salter et al. (2011). The data for the other two line ratios are from Öberg et al. (2010, 2011).

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