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κ = 180° self-rotation function for the dehydrated ethyl acetate-treated crystals plotted in polar angles showing pseudo-222 symmetry. The longitude lines represent θ and the latitude lines represent ϕ. The crystallographic twofold is the sharp peak at (0, 0). Peaks A (0, 90°) and B (90, 90°) are the noncrystallographic twofolds.
