Radial profiles of the ¹³CO 3-2 or 2-1 line (red) and ALMA continuum (gray), in combination with the maximum spatial extent of the PAH 3.3 μm emission (plum bar), and the derived spatial profiles of the PAH 8.6 (purple) and PAH 11.3 (indigo) features when available. The spatial extent is not constrained for the inner edge of the disk, so the inner region (PSF radius) is indicated as dotted rather than solid in the horizontal bar. For IRS 48, the spatial extent is only available for the 8.6 and 11.3 features. For HD 169142, the 11.3 emission is consistent with a ring (Devinat et al. 2022; Yoffe et al. 2023), which is overplotted as a dotted line. The ¹³CO curves are from Wölfer et al. (2023) and Zhang et al. (2021); the continuum curves are from this work. For HD 100453 ¹²CO 3-2 is plotted instead of ¹³CO 3-2, as they are the only available line data for this source. The spatial extent of the PAH emission is generally just inside the dust cavity.