The minimum flux in Janskys for the phase calibrator. This corresponds to the 1mm or 3mm flux, depending on the track type selected. The nearest source in the calibrator list that exceeds the flux specified here will be used as the phase calibrator. If no calibrators are found, you may need to lower the flux threshold.
Most pointing sources have a time-variable flux.
Consult the MMA database or an OVRO staff contact to obtain any recent flux measurements.