As with the results from the higher symmetry simulations, we find the barrier separating the γ polymorph from other observed forms to be the highest; the connection between γ and the other polymorphs is found at the same lid energy in the P 1 simulation as the simulation with P 1 symmetry constraints in the smaller unit cell. This fulfills our expectation that sampling in P 1 should find a transition path with an energy barrier at or lower than that found in space group-constrained trajectories.