External FUV flux estimated for the SODA sample. Crosses indicate the positions of Class II disks in the SODA catalog; the color indicates FUV irradiation. Disks with masses > 100 M_⊕ based on their millimeter flux are additionally marked with orange circles. Cyan stars mark possible ionizing stars in their vicinity. Background: Herschel SPIRE observations at 250, 300, and 500 μm.