The fully overlapped region sees no change in depletion with the 91 cm -1 amplification relative to the single pulse throughout the duration of the experiment. There is a statistical difference between 5-100 ps at the fully overlapped region (Fig. , pink). However, in the smaller time windows, there is only statistical significance between 5-10 ps (Table ) and we note several outliers in the kinetic data (Fig. , circles) that likely contribute to an artificial increase in the 91 cm -1 depletion in this time window. Because there is no statistical difference in any other time window, we confirm that the depletion magnitude at the fully overlapped region is not modified by the 91 cm -1 phonon mode. The increase in depletion magnitude along the slow transport axis relative to the single pulse is present at all time windows (Fig. ), except for the 10-20 ps window (Table ). In both the 20-50 ps and 50-100 ps windows, there is more than a 50% increase in depletion magnitude along the slow axis with amplification of the 91 cm -1 phonon. Interestingly, the decrease in the fast axis transport is greater at early time delays while the increase along the slow axis is greatest at later times. In the first 10 ps, the fast axis depletion magnitude decreases by 22% compared to the single pulse. However, fast axis depletion is not statistically different between 10-100 ps with amplification of the 91 cm -1 phonon mode (Table ). Comparison of single pulse and 91 cm -1 double pulse dynamics. A. Ground state depletion amplitudes, shown here as percent depletion per µW actinic power, for each excitation location in the single pulse (grey) and 91 cm -1 double pulse (pink). Circles refer to (0,0) excitation location, triangles refer to (2.7, 0) and squares represent (0, 2.7). Error bars denote one standard deviation of the fit amplitude. For clarity, the x axis up to 3 ps is displayed on a linear axis and 3-100 ps on a logarithmic scale. B. Single pulse (blue) and 91 cm -1 double pulse (pink) averaged ground state depletion for selected time windows. These data suggest that while more excitons are preferentially driven along the slow axis, the rate of travel is still slower along the b axis than the a axis. Along the fast transport axis, the differences between the single pulse and 91 cm -1 pulse are only in the first 10 ps of transport, suggesting that along the fast axis the excited state population is no longer suppressed by the 91 cm -1 phonon mode after 10 ps. Conversely, along the slow transport axis, the depletion magnitude is statistically significant from the single pulse data throughout the experiment, indicating that the 91 cm -1 mode modifies long time dynamics until at least 100 ps following photoexcitation. The excitons that are modified by the 91 cm -1 phonon mode are still exiting the probing region or decaying within a faster time frame along the a axis than on the b axis, suggesting that while the overall diffusion constants could be changing, the b axis remains slower than the a axis. However, directly measuring the exciton diffusion constants is outside the scope of this work given that this system is not built for fast scanning.