Correlations of the 7.7[lc]/11.2,8.6[lc]/11.2, and 11.0/11.2 AIB surface brightness ratios. The Spearman correlation coefficients (“R”) for the variables excluding (including) the points from the H ii region (black) and the regions beneath the IF (teal and dark blue) are indicated in red (black). Only the surface brightnesses from alternate spaxels are considered in the correlation analyses. The data points are colored according to regions in the mosaic where those pixels are located (top right panel). This visual region-color scheme is as follows: blue (atomic PDR), dark blue (east IF), teal (west IF), purple (DF 1), yellow (region between DF 1 and DF 2), orange (DF 2), light brown (region west of DF 2), brown (region between DF 2 and DF 3), pink (DF 3), and light purple (region beyond DF 3). The contours highlighting DF 2 and DF 3 are identified through enhanced emission of H₂ 0−0 S(3) in these DFs. The red circular regions on the color-region map (top right panel) correspond to the protoplanetary disks along the line of sight, which are masked in this analysis.