Simulations were analyzed using tools available in the GROMACS package as well as qunwarp, diffusion-GLS, and custom MDAnalysis 28 code. Curve fitting and statistical analyses were performed using SciPy. Notably, we computed the deuterium order parameter using gmx order. For details about autocorrelation analysis and for comparison of equilibrium distributions see Supporting Text sections 1.1 and 1.2.