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Figure 2
Harker construction. (a) SIR case. (b) SIRAS case. In (a), the two circles intersect at two different points, giving rise to the so-called phase ambiguity. In (b), the red, green and black circles intersect at one point, giving rise to an unambiguous phase determination.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 43| Part 5| August 2010| Pages 1230-1237
doi:10.1107/S0021889810028189
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