For linear scaling the uncertainties were estimated as follows. There were two sources for the uncertainty: the actual DFT measurements for atomic and species binding energies, and the uncertainty of the linear scaling relations themselves. The values for the uncertainty in the linear scaling trends were derived from the original Abild-Pedersen paper. This was the sample standard deviation for the trend line residuals for CH, CH 2 , CH 3 , and OH. An example of a linear scaling plot for CH 3 , along with its residuals, is shown in Figure .