Two strongest correlations between ratios of synthetic F770W, F1130W, and F1500W images and measured 7.7/11.2 spectroscopic PAH emission in the Orion Bar. Here the 7.7 μm feature is measured using the global continuum (Fig. 1). Best-fit lines to the data that exclude (include) the H ii region (black) as well as the region near the IF (teal and dark blue), with equations and Spearman correlation coefficients R are shown in red (black). The stars highlight the average values for the atomic PDR (blue), the H ii region (black), and the region near the IF (teal and dark blue).