Time evolution of the integrated change of vDOS curves averaged over 100 water molecules for libration (black), bending (red), and stretching modes (green) of water using the MMH-PES. In Panel A, the equilibrium, thermally averaged area before recombination is the reference for calculating the difference at time t whereas for Panel B the peak area right after excitation (t = 1ps) is the reference. Here, solid lines represent the 4-point moving average.