Comparison of the [S iii]/[S ii] line ratio measured across integrated Η ii region spectra from PHANGS-MUSE with the measurement obtained within the CHAOS 1″ slit for 13 H ii regions that overlap between the two surveys. Error bars are shown for both surveys, although the PHANGS errors are smaller than the symbols. The one-to-one line (black) shows that CHAOS systematically overestimates the line ratio by focusing on only the central brightest part of these extended Η ii regions, where the [S iii] emission is preferentially located. This demonstrates the challenges of applying such resolved measurements to broader Η ii region samples.