Fig. 1.
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Two examples of large-scale density structures observed by WISPR-I on April 26, 2021, 06:42 universal time (UT, top panel) and May 4, 2021, 11:27 UT (bottom panel). The helioprojective-radial coordinate grid is plotted as solid white isolines for the position angle (ψ, i.e. the anticlockwise angle from solar north) and dashed white isolines for the elongation angle (ϵ), both in degrees.
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