Water ion distribution functions observed at 08:00 (left column), 16:24 (mid column), and 20:46 (right column) on 20 January 2015. Panels a)–c) show the two-dimensional projection of the distribution function on a plane in velocity space. Panels d)–f) show the one-dimensional projection of the distribution functions on the horizontal axis of panels a)–c). Panels g)–i) show the same one-dimensional projection on a logarithmic vertical scale. The black curves show the data. The red, blue, and green curves show three different functions used as fits to the data. Corrections for the instrument offset and spacecraft potential have been applied. Densities and temperatures for the model curves are shown in Table 1.
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