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(a) Radial pair distribution for Pb-I site obtain from fits to Pb L3 edge XAFS data (see supplementary data Fig. S9). A fit using an asymmetric Gaussian function was utilized. The asymmetry in this fit as well for a classical potential mode (dashed line) reveals that the pair correlation of Pb-I is anharmonic. (b) Classical V(r) for generating the bond distribution which best fits the XAFS data. Note the non-negligible coefficients for the high order terms (third and fourth order).
