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Fig. B.3

image

Neutralising gas current J (black contours) and drift current Jdri (red for positive current and blue for negative), as a function of electric field E and dust metallicity Z1. The total current of the solids is separating to the left of the thick yellow zero-line and neutralising to the right of the zero-line. The drift current is at best 2–3 orders of magnitude smaller than the neutralising gas current.

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