Correlations between ratios of the synthetic images involving F770W, F1130W, and F1500W and the 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). Lines of best-fit through the data excluding (including) the points from the H II region (black), and the regions near the IF (teal and dark blue), their equations and the Spearman correlation coefficients R are shown in red (black). The star symbols highlight the average values for the atomic PDR (blue), the H ii region (black) and the region near the IF (teal and dark blue).