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(a), (b) Experimental and (c), (d) theoretical evolution of the XAS at the Ti K-edge of r-TiO2 for different angles of incidence θ. (a), (c) Pre-edge region. (b), (d) XANES and EXAFS. Isosbestic points are shown with black arrows. Thick lines in (c) are spectra calculated with dipole and quadrupole matrix elements; thin lines show the quadrupole matrix elements contribution only.
