CH destruction timescale associated with GCR irradiation as a function of the assumption on the low-energy flux contribution with the E0 parameter. The colored area gives the error bar obtained from the reported uncertainties on the cross section. The corresponding ionization rate calculated is reported on the opposite axis. The observed ionization rates (Fig. 19 in Indriolo & McCall 2012) for dense (NH column density ≈1023 cm-2) and mean values for diffuse clouds are shown with dashed lines.
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