3.3 μm PAH intensity as a function of various stellar and disk parameters. From left to right are shown the parameter χ (FUV radiation field at 150 au from the star) and the FUV radiation field at the inner disk edge R_in and at the disk outer edge R_size. The rightmost panel shows the 3.3 μm PAH intensity as a function of the total disk dust mass. Upper limits are indicated as empty circles with arrows. The Pearson correlation coefficient is indicated in the lower left corner of each panel.