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(a) Spectra from the blank under the three conditions, plotted as I 1/I 0 to emphasize the back-fluorescence signal. (b) Background-subtracted and normalized transmission spectra from 4.3 mM Na2SeO4 run under the three conditions. The 12663 eV shoulder is a small fraction of selenite produced by selenate photoreduction in the X-ray beam even at 10 K.
