Supplementary Online Material

This supplementary material contains two zipped folders named "Fig2_ supplementary", and "Fig3_supplementary". The folder Fig2_supplementary contains figures similar to Fig.2 but for all 32 collected Bragg peaks and as a function of temperature. Each figure contains an additional temperature information panel. These figures allow to inspect the phase transition during both heating and cooling. The folder Fig3_supplementary contains figures similar to Fig.3 but for all 32 collected Bragg peaks. The labels (e.g., T1, T2, T3, and C) demonstrate the assignment of the sub-peak to the corresponding tetragonal domains and to the cubic phase.