(∘), phase-shift uncorrected K-edge Fourier transform EXAFS spectrum of 0.1M Cu(ClO4)2 in frozen 1M HClO4 solution, and; (thick blue solid line), JT-octahedral, or; (red solid line), split axial model fit. Both models include a second shell of oxygen scatterers. Inset: The EXAFS spectrum fitted over the range k = 2-17 Å−1. Unfit residuals: (light blue solid line), JT-Oh, and (pink solid line), split axial.