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Fig. 4

image

Grain charge distribution f(Z) for four representative grains sizes a in the cloud envelope (nH = 104 cm−3, T = 10 K, ζ = 5 × 10−17 s−1). The non-Gaussian tails at positive charges is the result of photoemission by CR-induced secondary UV photons (see Sect. 3.2).

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