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Isointensity contours of Icc/Ibb in (θ, χ)-space for the Trp-38 Raman markers of Pf3 at 1368 cm−1 (W7″) and 1548 cm−1 (W3). Contours were obtained by substituting the appropriate Raman tensors from Table 1 into Eq. 1. The observed Raman intensity ratios, [Icc/Ibb]1368 = 7 ± 2 and [Icc/Ibb]1548 = 1.3 ± 0.3, restrict the acceptable Eulerian angles to the circled area of (θ, χ)-space, i.e., (73 ± 4°, 44 ± 3°).
