Data collection and refinement statistics.

aValues in parentheses correspond to the highest-resolution shell. bRsym = Σh Σi |Ih,i−h>|/Σh Σi h>, where Ih,i is the ith observation of reflection h and <Ih> is the weighted average intensity for all observations i of reflection h. cRcryst = Σ|Fo−Fc|/Σ|Fo|, where Fo and Fc are observed and calculated amplitudes, respectively. Rfree is calculated similarly using a test set of reflections. The test set (5% of reflections) is omitted in the refinement. dRoot mean square.