Data collection and refinement statistics.

(a)Values in parenthesis correspond to the outermost resolution shell.
(b)Rfactor = Σ||Fo|−|Fc||/Σ|Fo| where |Fo| and |Fc| are observed and calculated structure factor amplitudes, respectively.
(c)Free Rfactor is the cross-validation R-factor computed for a randomly chosen subset of 5% of the total number of reflections, which were not used during refinement.
(d)Diffraction-data precision indicator.