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![[Figure 4]](mf5041fig4mag.jpg)
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Figure 4
(a) Cumulative distribution of N(L) (L-test) calculated in TRUNCATE (French & Wilson, 1978  ) for perfectly twinned and untwinned data in comparison with the experimental diffraction data for 9Hyp/ANS. The blue and red curves represent the expected cumulative distributions of |L| for perfectly twinned and untwinned data, respectively, for acentric reflections. The black line shows the calculated cumulative distribution for the 9Hyp/ANS acentric diffraction data, indicating at least partial twinning. (b) Cumulative distribution of the H ratio [S(H) test] for acentric reflections of the 9Hyp/ANS diffraction data set. Colored continuous lines indicate theoretical cumulative distributions for twin fractions (α) of 0.0–0.4. The gray dotted lines show S(H) for (k, h, −l), (−h, −k, l) and (−k, −h, −l) subsets of reflections paired with (h, k, l). The shape of the experimental distributions suggests a twin fraction of ∼0.45 for each twin operator. |
![[Figure 4]](mf5041fig4.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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