Astronomy & Astrophysics

Table 1: Calibration sequence of NGC 1068. JD is the Julian date of the observation, N the number of processed interferograms, B and Az the projected baseline length and azimuth angle (east of north), and $\mu ^2$ the obtained coherence factors with their statistical errors. The interferometric efficiency (IE) given in italic characters is the value adopted for the calibration of the NGC 1068 data.