The 91 cm -1 phonon mode drives an increase in excited state population along the slow axis relative to the single pulse dynamics, indicating that this is a true driving mode of exciton transport along the slow axis. In the 5-100 ps averaged depletion (Fig. ), we see a 38% increase in signal along the slow axis and a 18% decrease along the fast axis with the 91 cm -1 double pulse compared to the single pulse. To investigate these dynamics more closely, we plot the kinetics (Fig. ) and the average depletion magnitude over smaller time windows (Fig. ). In the ground state depletion kinetics (Fig. ), at the fully overlapped region (top, circles) the single pulse and 91 cm -1 double pulse kinetics are qualitatively the same. However, the 91 cm -1 double pulse drives a decrease in depletion along the fast axis (middle, squares) but an increase in depletion along the slow axis (bottom, triangles). As previously discussed, we compare smaller time window averages of the single and 91 cm -1 pulse schemes and perform a t-test to determine statistical significance (Table ).