**Table 1:** Log of the observations of Achernar and its calibrator.
#	Baseline / Date	UTC	Target	B (m)	PA ( $^\circ$ )
	UT1-UT4
A	2006-11-06	01:59:46	$\alpha$ Eri	129.39	48.89
B	2006-11-06	02:26:23	HD 9362	129.66	54.55
C	2006-11-07	00:35:03	$\alpha$ Eri	130.22	32.23
D	2006-11-07	01:05:39	HD 9362	129.93	40.06
	UT1-UT2
E	2006-11-06	00:32:53	$\alpha$ Eri	52.38	4.94
F	2006-11-06	01:07:56	HD 9362	54.64	10.84
G	2006-11-06	03:15:57	$\alpha$ Eri	49.58	29.69
H	2006-11-06	04:08:42	HD 9362	50.53	35.36
	UT3-UT4
I	2006-12-07	02:48:10	$\alpha$ Eri	62.46	126.54
J	2006-12-07	03:11:45	HD 9362	61.76	132.33
K^*	2007-06-28	07:15:29	HD 9362	39.28	50.04
L^*	2007-06-28	07:51:38	$\alpha$ Eri	46.10	52.25

^* Due to a photometric instability, #K and #L were rejected.

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