Table 1: Calibration sequence of $\alpha $ Cen B on the B3-M0 baseline (140 m ground length). The expected visibilities $V^2_{\rm theo}$ given in this table include the bandwidth smearing effect. The interferometric efficiency given in italics corresponds to the value assumed for the calibration of these particular $\alpha $ Cen B observations (see Tables 2 and 3). The HR 4831 data marked with (*) were taken 2 h before $\alpha $ Cen B, and are listed to show the stability of the IE, but were not used for the IE estimation.
JD Scans B (m) Azim. $\mu^{2} \pm$ stat. (%) $V^2_{\rm theo} \pm$ syst. (%) IE $\pm$ stat. $\pm$ syst. (%) Target
2 452 770.5474 365 139.309 49.24 $29.37 \pm 0.39$ $49.93 \pm 0.80$ $58.83 \pm 0.79 \pm 0.94^{*}$ HR 4831*
2 452 770.5523 316 139.131 50.51 $29.38 \pm 0.51$ $50.06 \pm 0.80$ $58.70 \pm 1.02 \pm 0.93^{*}$ HR 4831*
2 452 770.5572 296 138.913 51.77 $30.05 \pm 0.67$ $50.19 \pm 0.80$ $59.88 \pm 1.34 \pm 0.95^{*}$ HR 4831*
2 452 770.6368 405 128.934 71.28 $32.05 \pm 0.35$ $55.48 \pm 0.75$ $57.78 \pm 0.62 \pm 0.77$ HR 4831
2 452 770.6419 408 127.841 72.49 $31.60 \pm 0.36$ $56.01 \pm 0.74$ $56.42 \pm 0.64 \pm 0.74$ HR 4831
2 452 770.6469 392 126.698 73.69 $32.72 \pm 0.36$ $56.54 \pm 0.73$ $57.87 \pm 0.64 \pm 0.74$ HR 4831
2 452 770.6605 299 133.838 59.85 $0.791 \pm 0.039$   $\it 57.36 \pm 0.82 \pm 0.74$ $\alpha $ Cen B
2 452 770.6656 235 133.277 61.33 $0.777 \pm 0.082$   $\it 57.36 \pm 0.82 \pm 0.74$ $\alpha $ Cen B


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