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Top left: NRVS spectra for (NEt4)(FeCl4) before (upper) and after (lower) recalibration. Data are respectively from APS (––), ESRF (––), Spring-8 (––) and PETRA-III (––). Top right: close-up of Fe-Cl stretching region before (upper) and after (lower) recalibration. Bottom left: schematic of dual sample operation for online calibration. Bottom right: overlap of spectra for (NEt4)(FeCl4) (––) and (NH4)2MgFe(CN)6 (––) calibration standards.
