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Figure 3
Arrangement of spots in reciprocal space. (a) A section k = constant of reciprocal space. The series of close spots parallel to axes [a_1^\ast] and [a_2^\ast] belong to two alternative lattices corresponding to two different orientations of individual crystals forming a polysynthetic OD twin by reticular merohedry with twin index 10 and with obliquity 0.13°. Owing to systematic absences in C2, reflections with even and odd h will only appear in the real diffraction pattern in sections with even and odd k, respectively. The axes of the two equivalent twinning operators coincide with the axes c* and a. The overlap between reflections from alternative lattices occurs only if the two reflections have the same index h and h ≃ 10n. Because of non-zero obliquity, spots with h = 10n do not overlap exactly except for h = 0. (b) If the reflections have the same size, the overlap is a periodical function of h and does not depend on k and l.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 63| Part 8| July 2007| Pages 926-930
doi:10.1107/S0907444907026315
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