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data from that particular observation are omitted from our analysis.) Since ux
calibration errors can substantially aect the results of the analyses to be discussed
below, these analyses are carried out using only those observations made when
the wind speed was less than 10 m=s, the object was above 30 ф elevation, there
was no precipitation, and the phase stability of the atmosphere allowed reliable
calibration of the complex antenna gains. Of the original 63 observations, three
were lost to equipment failures at the VLA site, calibrations for two were lost to
human error at operations, and one was lost to snow lling the dishes. Of the
remaining 57 observations, we exclude from analysis ve for high wind, eight for
precipitation, two for atmospheric phase instability, and seven for low elevation,
leaving 35 observations. Table 2 lists the measured ux densities for all components
for each of the 35 observations.
Julian Date Flux Densities (mJy) Julian Date Flux Densities (mJy)
2440000:0 A1 A2 B C 2440000:0 A1 A2 B C
8930.9968 153.8 134.6 59.8 22.6 9021.6846 154.0 137.0 59.0 22.9
8939.7717 163.7 146.0 66.1 22.9 9024.6766 151.4 134.6 58.4 22.1
8940.8936 153.2 135.8 59.2 22.6 9030.5334 156.7 139.1 59.0 22.4
8944.7380 161.7 142.2 63.7 23.1 9032.6650 151.8 136.5 57.7 22.6
8951.8637 148.4 131.3 58.3 21.7 9036.7067 155.1 137.1 58.8 22.6
8952.6917 158.0 139.7 60.5 23.4 9045.6612 157.7 138.8 59.6 23.1
8955.7073 160.8 140.8 62.7 23.3 9052.4733 154.1 133.8 58.9 20.9
8956.8501 152.7 136.6 60.0 22.9 9070.5746 159.6 140.0 59.6 23.4
8959.7535 147.6 130.5 58.2 21.4 9077.5345 162.4 145.0 61.0 23.7
8971.8451 150.8 132.7 58.3 22.5 9078.5392 160.3 143.0 61.3 22.9
8983.6726 150.8 133.9 59.4 22.0 9081.3337 149.4 129.9 55.1 21.4
8991.6712 149.6 133.0 57.3 22.3 9083.4761 144.5 127.0 54.2 20.7
8993.6338 163.8 145.5 62.8 24.4 9093.4906 152.1 132.8 56.9 21.5
8994.6986 148.8 131.7 57.7 22.2 9098.4980 152.5 133.3 56.8 21.9
9008.7038 148.1 132.9 57.0 21.1 9100.4928 158.8 139.4 59.2 23.5
9011.6065 146.9 130.4 58.8 22.0 9105.3149 155.1 139.2 60.5 22.7
9017.6137 151.5 133.8 57.6 22.0 9107.2857 156.1 137.2 59.7 22.8
9111.3782 149.2 131.7 56.8 22.1
Table 2: Table of measured ux densities (in mJy).
Figure 4 displays the measured light curves for all four images in MG0414. The
variability is still clearly dominated by the ux calibration errors caused by variable
atmospheric water content, dierences in source and calibrator elevations, ux cali-
brator modelling errors, and weather conditions. Even with these eects, the RMS
variability in the resulting four light curves (without any adjustment for possible
source variability) is only 3.3{3.9%. Since this includes both source variability and
ux calibration errors, the relative ux calibration is at least this good over the
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