Table 2: List of calibrators used in the present work, together with 12 $\mu $m fluxes (F12), uniform-disk diameters ( $d_{\rm {UD}}$) and the date as well as the time stamp ( $t_{\rm obs}$) of the MIDI observations. The uniform-disk diameters were taken from the CalVin list available at ESO (http://www.eso.org/observing/etc/).
Calibrator F12 (Jy) $d_{\rm {UD}}$ (mas) Date $t_{\rm obs}$ (UTC)
HD number     (2004)  
18322 13.3 $2.50\pm 0.12$ Feb. 09 00:39:11
      Feb. 09 01:39:04
49161 10.4 $2.88\pm 0.17$ Feb. 09 02:45:52
      Feb. 10 04:43:21
67582 9.3 $2.69\pm 0.25$ Feb. 09 06:24:15
      Feb. 09 07:13:39
      Feb. 10 02:37:04
      Feb. 10 03:46:12
107446 32.4 $4.54\pm 0.23$ Feb. 09 08:08:53
      Feb. 10 08:16:44
85951 12.6 $3.48\pm 0.18$ Feb. 11 02:42:15
      Feb. 11 05:37:52
120404 13.3 $3.03\pm 0.24$ Feb. 11 07:36:34
      Feb. 11 08:27:38


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