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Anomalous difference electron-density maps contoured at 5σ. (a) At a wavelength preceding the Zn K edge (1.295 Å) the residual scattering from the Fe present in the samples indicates that both the α and β sites are occupied at similar levels. (b) Upon moving past the Zn K edge (1.280 Å) the anomalous scattering of Zn reveals that Zn is mostly coordinated at the α site.
