3.3 μm PAH intensity as a function of the warm dust mass, computed from the millimeter flux inside the 30 K radius (CO snowline). The different colors represent the transition disks (TDs, red), compact disks (CDs, blue), and ring disks (RDs, purple). Upper limits are indicated as empty circles with arrows. The dashed line shows the best linear fit for the data points with the gray lines showing the spread between the fits. The fit has a Pearson coefficient of r = 0.88 ± 0.07 and the data are strongly correlated.