Observed fluxes of V1057 Cyg, V2494 Cyg, and V2495 Cyg. Measurements were made at 224−225 GHz if not specifically annotated. Black line in the bottom panel shows the measured and applied flux values of the gain phase and amplitude calibrator for these observations, 3C418. The absolute flux reference sources of these observations are listed in Table D.1. In the panel of 3C418, gray symbols and dotted line quote the tablized 224−225 GHz flux values and errors from the SMA Calibrator List, which is maintain by Mark Gurwell. For the target source measurements, the chosen minimum uv distances are annotated in individual panels. For each source, we chose an identical minimum uv distance for each (time) epoch of measurement.