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Fig. 3
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Histograms of the ratio between collisional and radiative excitation rates, CCR/Crad, for five representative column densities, from 1020 to 1022 cm−2, for an interstellar UV field with χ = 1, RV = 3.1, and model ℋ. The black dashed line shows where collisional and radiative processes equally contribute to excitation of H2.
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