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Fig. 3
Ionisation fractions as a function of the CR ionisation rate at density n(H2) = 106 cm-3 assuming large grains (amin = 10-5 cm, solid lines) and small grains (amin = 10-7 cm, dotted lines). Dashed grey lines show the trend for xi ∝ ζH2 and xi ∝ (ζH2)1 / 2.
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