Measured SAXS data (solid line) for the MgSiO₃ precursor gel phase presented in standard SAXS plots (see Appendix A.2). Panel A: Guinier plot; panel B: Porod plot; panel C: Zimm plot and panel D: Kratky plot (where the positions of a broad and a narrow feature are labelled K1 and K2 respectively). Dashed lines show fits to linear regions (labelled G1, P1, Z1 and Z2) in the Guinier, Porod and Zimm plots and from which various lengths and dimensions can be derived (see Appendix A.2 and text in Sect. 3.1.1.)