Fig. 7.
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Top: the ground-state HCN/HNC isomer ratio as a function of FIR luminosity (left) and the 12CO/13CO isotopologue ratio (right). Center: the ground-state HCN/CO (left) and HCO+/HCN (right) ratios as a function of the (inverse) HNC/HCN isomer ratio. Bottom: the ground-state HCO+/HCN (left) and HNC/HCN (right) ratios as a function of the HNC/HCO+ ratio. Solid lines mark unity isomer ratios. Fit parameters are listed in Table 8.
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