Data collection, phasing, and refinement statistics.

aParenthesis indicate outer-shell statistics.bRsym = ∑hkl∑i|Ihkl,i−Ihkl>|/∑hk∑i Ihkl,i Ihkl,i is the scaled intensity of the ith measurement of reflection h, k, l,.Ihkl> is the average intensity for reflection I, and N is the number of observations of I.cRcryst = ∑hkl|Fo−Fc|/∑hkl|Fo|, where Fo and Fc are the observed and calculated structure factors.dRfree was calculated as for Rcryst, but using 5% of data, randomly chosen and excluded from refinement.Data collection, phasing, and refinement statistics.