Fig. 1
Relaxation timescales (Eq. (3)) of OH (cyan crosses), H2O (magenta squares), HCO+ (red circles), CO (blue triangles), and CH+ (orange upside-down triangles) computed with the TDR model as functions of the shielding AV of the UV field (left panel) and the density nH of the gas (right panel), all the other parameters being set to their standard values (see Table 1).
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