Materials with associated bulk modulus (K) calculations were extracted from the Materials Project database using the materials API, totalling 13,172 materials. Anomalous entries with K ≤ 0 were removed (12). To facilitate analysis, only entries with elements up to Bi (atomic number 83) exclusive of noble gas elements were kept. This means that, specifically to this dataset, entries with elements Ne, Kr and Ac-Pu were removed (788 materials). GRIDs were calculated to a maximum distance of 10 Å (see results for algorithm). Extremely low-density structures with fewer than 100 histogram 'groups' at 10 Å (194 materials) were omitted from analysis, leaving 12,178 materials in the analysed data. The distribution of the resulting bulk moduli range from 0 -600 GPa, with most materials below 100 GPa (Fig. ).