Common donor and acceptor materials were assigned many different energy level values in the dataset. However, our models have no way of accounting for that variability, which can arise from a number of possible sources. To standardize the reported energy levels, we fit Gaussian distributions to any material with two or more unique energy level values, and replaced them with the fitted mean. However, certain materials were reported to have the same exact energy level in multiple Upon further investigation, we found that this is due to works simply reporting a value from another paper. In instances where the same energy level value occurred more than ten times for a given material, we only counted it once when performing the Gaussian fitting.