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Fig. 3

image

Energy of the ions at the surface of the dust grain, Esf , as a function of gas pressure. The ionic energies, Esf , are given for electron temperatures Te = Tgas (green), 1 eV (blue) and 10 eV (black); and, degrees of ionisation fe = 1 (dot-dash), 10−4 (dot) and 10−7 (dash).

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