Even though the potential is trained on trajectories starting from full 1 ML (1×1) coverage, due to desorption, the potential is also trained on effectively lower coverages and can be used for such simulations. Experimentally, it is known that H adsorbed on Ru(0001) forms ordered structures for 1/3, 1/2, 3/4, and 1 ML. In Table we have calculated associative desorption energies, i.e., minimal barriers for the desorption of a hydrogen molecule, for each of these structures in the (6×6) unit cell. It is seen from the table that the desorption energy rapidly increases as coverage decreases. As discussed below, and observed in experiments, this also significantly decreases femtosecond laser-induced desorption for lower coverages.