Figure 1.

Count of $s{p}^3$ (fourfold coordinated) carbon atoms in quenched a-C structures as a function of density. Ten independent melt-quench cycles were performed at each density for the empirical and GAP models; three independent ones were done for DFT. Error bars represent standard deviations. Lines between data points are only guides to the eye. Reprinted figure from [39]. Copyright (2017) by the American Physical Society. (Online version in colour.)