Table 3: (a) Squared visibilities of Achernar in the K band from VINCI, ordered by increasing azimuth angle of the projected baseline. The calibrators are named using their HR number, when no Bayer designation is available. The stated Julian date JD₀ is JD $-~2.452\times10^6$ . The azimuth is counted in degrees clockwise from North ( $N=0\deg$ , $E=90\deg$ ), and B is the projected baseline in meters. The squared visibilities are followed in subscript by the statistical and calibration uncertainties.
JD₀ Cal. Stations B (m) Az. V² (%)

548.551 $\alpha$ PsA B3-M0 139.44 7.3 $45.7 _{ \pm 1.5 \pm 4.1 }$

546.558 $\alpha$ PsA B3-M0 139.48 7.9 $42.7 _{ \pm 4.4 \pm 3.3 }$

548.555 $\alpha$ PsA B3-M0 139.46 8.7 $46.3 _{ \pm 1.5 \pm 4.2 }$

548.560 $\alpha$ PsA B3-M0 139.48 10.2 $44.4 _{ \pm 1.5 \pm 4.0 }$

547.595 $\alpha$ PsA B3-M0 139.61 20.2 $45.9 _{ \pm 2.1 \pm 3.8 }$

545.604 $\alpha$ PsA B3-M0 139.69 21.2 $50.6 _{ \pm 1.6 \pm 2.4 }$

547.600 $\alpha$ PsA B3-M0 139.63 21.8 $45.0 _{ \pm 2.1 \pm 3.7 }$

545.608 $\alpha$ PsA B3-M0 139.70 22.6 $52.6 _{ \pm 1.6 \pm 2.5 }$

547.605 $\alpha$ PsA B3-M0 139.65 23.3 $46.5 _{ \pm 2.2 \pm 3.8 }$

545.613 $\alpha$ PsA B3-M0 139.72 24.0 $51.7 _{ \pm 1.5 \pm 2.5 }$

216.589 1318 U1-U3 95.29 24.2 $67.9 _{ \pm 1.1 \pm 0.5 }$

216.592 1318 U1-U3 95.15 24.8 $66.6 _{ \pm 1.3 \pm 0.5 }$

545.622 $\alpha$ PsA B3-M0 139.72 26.7 $49.7 _{ \pm 1.5 \pm 2.4 }$

545.626 $\alpha$ PsA B3-M0 139.72 28.0 $48.7 _{ \pm 2.2 \pm 2.3 }$

534.712 $\chi$ Phe U1-U2 44.61 29.6 $87.3 _{ \pm 1.6 \pm 0.4 }$

545.632 $\alpha$ PsA B3-M0 139.70 29.9 $51.3 _{ \pm 2.2 \pm 2.4 }$

534.714 $\chi$ Phe U1-U2 44.56 30.1 $89.3 _{ \pm 1.6 \pm 0.4 }$

575.637 37, 2305 U1-U3 93.34 31.3 $73.2 _{ \pm 2.8 \pm 1.3 }$

213.654 $\chi$ Phe U1-U3 91.22 36.9 $76.3 _{ \pm 2.2 \pm 1.6 }$

213.655 $\chi$ Phe U1-U3 91.12 37.2 $77.4 _{ \pm 2.3 \pm 1.6 }$

213.658 $\chi$ Phe U1-U3 90.79 37.9 $72.4 _{ \pm 2.2 \pm 1.5 }$

213.660 $\chi$ Phe U1-U3 90.62 38.3 $75.2 _{ \pm 2.0 \pm 1.6 }$

534.749 $\chi$ Phe U1-U2 43.54 38.7 $88.9 _{ \pm 2.1 \pm 0.4 }$

213.663 $\chi$ Phe U1-U3 90.28 39.0 $72.3 _{ \pm 2.0 \pm 1.5 }$

534.750 $\chi$ Phe U1-U2 43.48 39.1 $84.3 _{ \pm 1.5 \pm 0.4 }$

534.752 $\chi$ Phe U1-U2 43.40 39.6 $85.4 _{ \pm 1.6 \pm 0.4 }$

556.635 $\delta$ Phe B3-M0 139.20 39.8 $59.2 _{ \pm 4.1 \pm 1.7 }$

214.664 1318 U1-U3 89.89 39.9 $68.8 _{ \pm 1.7 \pm 0.5 }$

534.755 $\chi$ Phe U1-U2 43.32 40.2 $82.9 _{ \pm 1.7 \pm 0.4 }$

214.667 1318 U1-U3 89.60 40.5 $66.2 _{ \pm 1.6 \pm 0.5 }$

556.642 $\delta$ Phe B3-M0 139.02 41.7 $55.3 _{ \pm 4.0 \pm 1.6 }$

213.675 $\chi$ Phe U1-U3 88.92 41.8 $72.6 _{ \pm 2.0 \pm 1.5 }$

214.675 1318 U1-U3 88.69 42.2 $70.2 _{ \pm 1.7 \pm 0.5 }$

556.646 $\delta$ Phe B3-M0 138.88 42.9 $54.3 _{ \pm 3.8 \pm 1.6 }$

213.691 $\chi$ Phe U1-U3 87.05 45.1 $73.5 _{ \pm 2.2 \pm 1.5 }$

**Table 3:** **(a)** Squared visibilities of Achernar in the K band from VINCI, ordered by increasing azimuth angle of the projected baseline. The calibrators are named using their HR number, when no Bayer designation is available. The stated Julian date JD₀ is JD $-~2.452\times10^6$ . The azimuth is counted in degrees clockwise from North ( $N=0\deg$ , $E=90\deg$ ), and B is the projected baseline in meters. The squared visibilities are followed in subscript by the statistical and calibration uncertainties.
JD₀	Cal.	Stations	B (m)	Az.	V² (%)
548.551	$\alpha$ PsA	B3-M0	139.44	7.3	$45.7 _{ \pm 1.5 \pm 4.1 }$
546.558	$\alpha$ PsA	B3-M0	139.48	7.9	$42.7 _{ \pm 4.4 \pm 3.3 }$
548.555	$\alpha$ PsA	B3-M0	139.46	8.7	$46.3 _{ \pm 1.5 \pm 4.2 }$
548.560	$\alpha$ PsA	B3-M0	139.48	10.2	$44.4 _{ \pm 1.5 \pm 4.0 }$
547.595	$\alpha$ PsA	B3-M0	139.61	20.2	$45.9 _{ \pm 2.1 \pm 3.8 }$
545.604	$\alpha$ PsA	B3-M0	139.69	21.2	$50.6 _{ \pm 1.6 \pm 2.4 }$
547.600	$\alpha$ PsA	B3-M0	139.63	21.8	$45.0 _{ \pm 2.1 \pm 3.7 }$
545.608	$\alpha$ PsA	B3-M0	139.70	22.6	$52.6 _{ \pm 1.6 \pm 2.5 }$
547.605	$\alpha$ PsA	B3-M0	139.65	23.3	$46.5 _{ \pm 2.2 \pm 3.8 }$
545.613	$\alpha$ PsA	B3-M0	139.72	24.0	$51.7 _{ \pm 1.5 \pm 2.5 }$
216.589	1318	U1-U3	95.29	24.2	$67.9 _{ \pm 1.1 \pm 0.5 }$
216.592	1318	U1-U3	95.15	24.8	$66.6 _{ \pm 1.3 \pm 0.5 }$
545.622	$\alpha$ PsA	B3-M0	139.72	26.7	$49.7 _{ \pm 1.5 \pm 2.4 }$
545.626	$\alpha$ PsA	B3-M0	139.72	28.0	$48.7 _{ \pm 2.2 \pm 2.3 }$
534.712	$\chi$ Phe	U1-U2	44.61	29.6	$87.3 _{ \pm 1.6 \pm 0.4 }$
545.632	$\alpha$ PsA	B3-M0	139.70	29.9	$51.3 _{ \pm 2.2 \pm 2.4 }$
534.714	$\chi$ Phe	U1-U2	44.56	30.1	$89.3 _{ \pm 1.6 \pm 0.4 }$
575.637	37, 2305	U1-U3	93.34	31.3	$73.2 _{ \pm 2.8 \pm 1.3 }$
213.654	$\chi$ Phe	U1-U3	91.22	36.9	$76.3 _{ \pm 2.2 \pm 1.6 }$
213.655	$\chi$ Phe	U1-U3	91.12	37.2	$77.4 _{ \pm 2.3 \pm 1.6 }$
213.658	$\chi$ Phe	U1-U3	90.79	37.9	$72.4 _{ \pm 2.2 \pm 1.5 }$
213.660	$\chi$ Phe	U1-U3	90.62	38.3	$75.2 _{ \pm 2.0 \pm 1.6 }$
534.749	$\chi$ Phe	U1-U2	43.54	38.7	$88.9 _{ \pm 2.1 \pm 0.4 }$
213.663	$\chi$ Phe	U1-U3	90.28	39.0	$72.3 _{ \pm 2.0 \pm 1.5 }$
534.750	$\chi$ Phe	U1-U2	43.48	39.1	$84.3 _{ \pm 1.5 \pm 0.4 }$
534.752	$\chi$ Phe	U1-U2	43.40	39.6	$85.4 _{ \pm 1.6 \pm 0.4 }$
556.635	$\delta$ Phe	B3-M0	139.20	39.8	$59.2 _{ \pm 4.1 \pm 1.7 }$
214.664	1318	U1-U3	89.89	39.9	$68.8 _{ \pm 1.7 \pm 0.5 }$
534.755	$\chi$ Phe	U1-U2	43.32	40.2	$82.9 _{ \pm 1.7 \pm 0.4 }$
214.667	1318	U1-U3	89.60	40.5	$66.2 _{ \pm 1.6 \pm 0.5 }$
556.642	$\delta$ Phe	B3-M0	139.02	41.7	$55.3 _{ \pm 4.0 \pm 1.6 }$
213.675	$\chi$ Phe	U1-U3	88.92	41.8	$72.6 _{ \pm 2.0 \pm 1.5 }$
214.675	1318	U1-U3	88.69	42.2	$70.2 _{ \pm 1.7 \pm 0.5 }$
556.646	$\delta$ Phe	B3-M0	138.88	42.9	$54.3 _{ \pm 3.8 \pm 1.6 }$
213.691	$\chi$ Phe	U1-U3	87.05	45.1	$73.5 _{ \pm 2.2 \pm 1.5 }$

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