Structure refinement statistics.

aRmerge = Σ |Iobs - Iavg|/Iobs, where Iobs is the observed intensity of individual reflection and Iavg is average over symmetry equivalents.bThe numbers in parentheses are statistics from the highest resolution shell.cRwork = Σ ||Fo| - |Fc||/Σ |Fo|, where |Fo| and |Fc| are the observed and calculated structure factor amplitudes, respectively. Rfree was calculated with 5% of the data.Structure refinement statistics.