Best fit to V² from the best single-layer models across the first CO band head for our two epochs. The colored dots and the shaded regions correspond to the best-fit models and their corresponding error-bars. Each color correspond to a different wavelength (see labels on the plot). The data are shown with black dots. We highlight that the spatial frequencies increase in opposite directions depending on the epoch. This allowed us to have a better visual comparison of the trends present in the V² data between the two epochs. Also, for better visualization, we displaced the V² vertically.