Another way to illustrate this is to consider the performance of the 3.2k model for a trajectory generated with the 3.2Mio potential in comparison with its own trajectory. Specifically this means that we generate two independent trajectories with the 3.2k and 3.2Mio model and evaluate MAEs of the 3.2k model for configurations drawn from each trajectory. Taking the molecule in Fig. at 1200 K, the F MAE of the 3.2k potential is 6.8 eV Å-1 for the 3.2k trajectory but only 0.16 eV Å-1 when it is evaluated on the 3.2Mio trajectory. Again, the sparse model performs quite well for the physically reasonable configurations generated with the 3.2Mio model. The problem only becomes apparent when testing the sparse model on its own trajectory.