The LSR model used a similar method to calculate the covariance matrix, using the ensemble of values generated for each species on platinum instead of rhodium. The residual error from linear scaling (R LSR ) in Equation was not used as a single value in the uncertainty calculations. Instead, each member of the 2000 member ensemble was run through the linear scaling equation 2 million times, using a random sample from a normal distribution with = R LSR in place of the single value used for the residual error. The resulting ensembles of binding energies for each species were then run through Equation 13 to generate the covariance matrix.