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Figure 1
(a) The optical indicatrix of an orthorhombic system in the rhombic orientation, viewed down [100]pc and [001]pc, is shown in dotted red and dashed blue lines, respectively. Orthorhombic refractive indices are shown in grey and pseudocubic in black. The orientation of the orthorhombic axes in one of the crystal plates used for the Metripol measurements is shown in (b) and (c).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 50| Part 2| April 2017| Pages 378-384
https://doi.org/10.1107/S1600576717000309
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