Top panel: Correlations of PC₁ with the total surface brightness i.e., the sum of the surface brightnesses of all the AIBs (left), with the total surface brightness without contributions from the 11.25 µm and µm components (middle), and the 11.207 µm AIB surface brightnesses (right). Middle panel: From left to right, correlations of PC₂ with the 11.25 µm, 12.0₂ µm and 13.5 µm AIB surface brightnesses. Bottom panel: The data points are colored according to regions in the mosaic where those pixels are located, per the color bar.