Table 4. Accuracy of the 6D PES in Comparison with DFT Calculations^a.

energy	N	RMSE (1)	RMSE (2)	MAE (1)	MAE (2)	MSE (1)	MSE (2)
(0.0–0.69)	100	0.024	0.009	0.012	0.007	0.006	0.007
(0.69–1.38)	100	0.086	0.021	0.044	0.020	0.008	0.020
(1.38–2.07)	100	0.132	0.036	0.069	0.031	0.015	0.031

^aAll energies are in eV, with the zero of energy taken as the gas-phase-H₂ minimum energy. N is the number of data points. The number in brackets behind the error refers to the method used to evaluate the error in Section 2.2.