Fig. 7
N(HCO+)/N(CO) (top panel) and N(CN)/N(CO) (bottom panel) versus N(CO). The gray area indicates the range of values obtained with our grid of models with L∗, nH and Md/Mg in the range given in Table 2, and LX and T∗ the same for the standard model. The solid curve represents the standard model. Squares represent observational data.
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