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Self-rotation stereograms calculated with MOLREP (Vagin & Teplyakov, 2010 ▸) at χ = 180° for crystal forms A and B. (a) Two peaks are found for crystal form A at θ = 84.0°, φ = 90.4° and θ = 84.9°, φ = −100.5°, indicating the presence of two dimers in the asymmetric unit. (b) The same calculation for crystal form B displays a unique noncrystallographic peak at θ = 79.4°, φ = 90.1°.
