2AD plot for 1941 acentric Friedel pairs retrieved from the SHELXL fcf file for the last refinement cycle of the title compound (Sheldrick, 2015b). The Dobs against Dmodel of all Friedel pairs (blue squares) and the 2Aobs against 2Amodel for weak Friedel pairs (red circles) are displayed. On the left, Dobs − Dmodel (green triangles) and 2Aobs − 2Amodel (violet triangles) of all Friedel pairs are displayed, at arbitrary fixed abscissa. The style of the 2AD plot follows that used in the articles of Flack et al. (see, for example, Fig. 3 in Parsons et al., 2012).