Top and bottom spectra represent the benchmark models with respectively 100% neutral and 100% ionized PAHs. The middle four spectra show transitional disks with the dotted black line showing the Spitzer observations, the solid black lines the total fluxes of the best fit models, the solid blue line the contribution from PAHs in the dust disk, and the solid red line the contribution from the low density optically thin disk. Note that for HD 97048, there is no low density optically thin disk component thus the solid black and blue lines are merged into a dashed blue-black line. For Oph IRS 48, the spectrum is dominated by ionized PAHs from the low density optically thin disk.