Projection of the WST coefficients onto principal components PC1 and PC2 for subregions with (orange) and without (cyan) tidal tail injection. The top panel shows the histogram with respect to PC1. The PCA is trained with cirrus-only subregions. Even with only one component, the histograms for subregions with and without tidal tails show clustering with different peaks, although there is some overlap. This supports the feasibility of using dimension reduction on WST coefficients to distinguish tidal features from cirrus.