(a.) Pressure-dependent PFM measurements from a 10x10 μm2 area (Supplementary Fig. 6). (b.) Histograms of measured piezoelectric response of CIPS only. (c.) Pressure-dependent piezoelectric constant extracted for four distinct states and theoretical piezoelectric constant from theory for comparison. Data points are the position of the histogram peaks for each phase and error bars correspond to the peak widths. The d-value is constant or decreasing for LP and increases for HP. The +HP state (light blue) transforms into the -HP state (yellow) indicating a pressure-induced switching event. All changes are reversible. Response on the IPS phase changes little with contact force (see also Supplementary Fig. 7b).