Once the corrosion measurements were finished, the sample was quenched to room temperature. The following day, the distribution of Ni within the sample was measuring by performing XANES along the vertical direction of the BN cell at room temperature. The beam was (inadvertently) placed in in a different horizontal position on the cell for these measurements. The XANES measurements were scanned over a range of 6 mm with 5 spectra captured and averaged for each position.