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PRIGo space envelopes for full ω turns with different χ-offsets. Envelopes are shown for increasing χ values of (a) 0°, (b) 30°, (c) 60° and (d) 90. A view of PRIGo with a sample at the tip (standard 18 mm pin) is overlaid for (a) and (d) for better visualization of the goniometer’s parts.
