Supplement Number 2

This supplement consists of four files: (1) ss3a_qref-e contains the position vector of the initial wavepacket; (2) fig4_kappa contains the Hessian matrix of the harmonic system used to generate Figure 4 (with Duschinsky rotation); (3) figS1_kappa contains the Hessian matrix of the harmonic system used to generate Figure S1 (without Duschinsky rotation); (4) overlap.py contains a Python code for evaluating the overlap of two Hagedorn functions.