Table 3: Details of our VLTI/VINCI observations of $\gamma $ Sagittae (date and time of observation, spatial frequency, azimuth angle of the projected baseline (E of N)), together with the measured squared visibility amplitudes and their errors. The last column denotes the number of successfully processed interferograms for each series. The effective wavelength for our $\gamma $ Sagittae observations is $\sim $2.19 $\mu $m. For each date of observation, we list the equivalent uniform disc (UD) diameter obtained from only the data of the specific night. Using all data together, we obtain an equivalent UD diameter of $\Theta _{\rm UD}=5.93$ $\pm $ 0.02 mas, or an equivalent FDD diameter of $\Theta _{\rm FDD}=6.69$ $\pm $ 0.02 mas.
UT Sp. freq az V2 $\sigma_{V^2}$ #
  [1/ $^{\prime\prime}$] [deg]      
28 June 2002, $\Theta_{\rm UD}=5.91\pm0.03$ mas
05:16:57 131.14 136.63 1.825e-01 8.074e-03 161
05:22:40 130.08 136.65 1.828e-01 8.852e-03 152
05:32:34 128.15 136.73 2.077e-01 7.578e-03 172
06:44:22 111.69 139.42 3.112e-01 1.079e-02 80
8 July 2002, $\Theta_{\rm UD}=5.89\pm0.04$ mas
05:12:10 124.21 137.05 2.241e-01 7.199e-03 397
05:20:13 122.44 137.27 2.426e-01 7.846e-03 418
11 July 2002, $\Theta_{\rm UD}=5.98\pm0.04$ mas
03:06:45 142.16 138.28 1.064e-01 1.256e-02 55
05:29:49 117.47 138.08 2.495e-01 8.775e-03 69
05:34:22 116.38 138.31 2.660e-01 9.929e-03 207
05:40:41 114.83 138.64 2.878e-01 8.524e-03 297
05:47:01 113.25 139.02 2.977e-01 1.228e-02 198
15 July 2002, $\Theta_{\rm UD}=5.94\pm0.05$ mas
04:22:40 128.76 136.70 1.926e-01 6.824e-03 90
04:41:27 124.90 136.98 2.223e-01 1.315e-02 139
8 August 2002, $\Theta_{\rm UD}=5.92\pm0.03$ mas
03:05:49 125.17 136.95 2.179e-01 7.678e-03 469
03:12:20 123.77 137.10 2.244e-01 9.005e-03 436
03:18:34 122.39 137.27 2.309e-01 7.979e-03 468
03:24:34 121.03 137.47 2.471e-01 1.901e-02 178
04:13:56 108.94 140.21 3.376e-01 1.212e-02 423
12 September 2002, $\Theta_{\rm UD}=5.99\pm0.11$ mas
01:26:22 116.44 138.29 2.607e-01 1.547e-02 190
01:47:17 111.24 139.54 3.407e-01 4.631e-02 105
18 September 2002, $\Theta_{\rm UD}=5.88\pm0.05$ mas
00:32:53 123.38 137.15 2.347e-01 1.081e-02 428
00:40:53 121.59 137.39 2.393e-01 1.177e-02 407
00:47:14 120.14 137.61 2.667e-01 1.751e-02 210

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