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Fig. 3

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Ionisation fraction in the mid-plane for the best ring fit. Discontinuities indicate the borders between different rings. For this particular fit, the innermost ring (1–10 AU) is empty, thus the ionisation fraction is not defined there. The difference in ionisation for the outermost ring (150–300 AU) is due to the four times higher best-fit density in the SW for this ring (see Table 3).

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