Figure 1 The application of the unit-cell scattering power method (Li et al., 2022) on corundum (α-Al2O3). The sum of squared structure factors of a corundum cell can be estimated through the sum of squared structure factors of 12 imaginary Al crystals and 18 imaginary O crystals in the corundum unit cell. `cell_Z' denotes the number of Al2O3 molecules in the corundum unit cell.