Comparison of the chemical evolution using KIDA reaction rates (solid lines) and our rates (dashed lines). We report the species that present a difference of at least half an order of magnitude and reach at least n(t) = 10⁻⁸n_H,tot. The ionization rate of H₂ is 1.64 × 10⁻¹⁶ s⁻¹, and the rate for model “High” and with the assumptions described in the text corresponds to A_v = 10.6 and N = 10²² cm ⁻².