Fig. 4: Distribution of RSE errors for different combination of training and testing data.
From: Training data selection for accuracy and transferability of interatomic potentials

A Trained on EM and validated on EM; B trained on DE and validated on EM; C Trained on EM and validated on DE; D trained on DE and validated on DE. Only errors within three standard deviations from the observed mean value, about ~99% of the data, are reported to clearly convey the shape of the distribution.