The zip file contains all experimental data used to perform the data analyzed presented in the manuscript. The GAO_data folder is categorized as followed: -) Figures_manuscript: Files (*.txt) used to prepare the manuscript figures. -) X_ray_energy: Subfolders Data_1,2: raw X-ray data collected at the beamline Xtreme. Energy scans. Readme_1: It explains the files -) X_ray_hysteresis: Subfolder Data_3: raw X-ray data collected at the beamline Xtreme. Hysteresis scans. Readme_2: It explains the files -) X_ray_XLD_XMCD: Subfolder XMCD_XLD: raw energy scans with circular/linear polarization light. Readme_3: It explains the files -) X_ray_XLD: Subfolder XLD: raw energy scans with linear polarization light for different sample orientations. Readme_4: It explains the files -) Simulation: Subfolder Ti3+_XAS_XLD_XMCD: Data used for the Ti3+ simulations using the software CTM4XAS. Subfolder Ti4+_XAS_XLD_XMCD: Data used for the Ti4+ simulations using the software CTM4XAS. Readme_5: Simulations input/data Requests for any supporting information, such as further model information, unproccesed raw data or any other questions, can be emailed to Dr. Urs Staub (urs.staub@psi.ch).