Figure 5.

Anomalous difference Fourier maps for d(CGCG[BrU]G) computed to 1.1 Å resolution. The maps are projected down the crystal c axis. For each map, the origin is located at the upper left corner and the a axis is along the vertical direction. Contours are at intervals of 0.4 e⁻ Å⁻³. (a) Map computed from data set (II) merged in point group 222. The symmetry elements of space group P2₁2₁2₁ are displayed in blue. (b) Map computed from data set (I) merged in point group 1. (c) Map computed from data set (II) merged in point group 1. (d) Map computed from data set (III) merged in point group 1. The figures printed in red next to each peak indicate the angle between the direction of X-ray polarization and the C—Br bond direction of the corresponding Br site.