Step II employs atom-centered potentials (ACPs) that are designed to mitigate the effects of incomplete correlation and incomplete basis sets associated with the HF-D3(BJ)/MINIs approach. Step III uses a form of ACPs called basis set incompleteness potentials (BSIPs) designed to reduce the effects of incomplete basis sets used with conventional density-functional theory (DFT) based methods. Steps I-III employed g16, and the process is summarized in Figure .