Table 1: Journal of observations. Phases $\phi$ refer to the ephemeris of WR20a (Rauw et al. 2007).
Name Start time End time $\phi$

Obs 1 2003/08/23, 18:21:23 2003/08/24, 04:53:56 0.34-0.46

Obs 2 2006/09/05, 15:52:01 2006/09/06, 06:29:22 0.28-0.44

Obs 3 2006/09/28, 05:46:20 2006/09/28, 20:14:43 0.41-0.57

**Table 1:** Journal of observations. Phases $\phi$ refer to the ephemeris of WR20a (Rauw et al. 2007).
Name	Start time	End time	$\phi$
Obs 1	2003/08/23, 18:21:23	2003/08/24, 04:53:56	0.34-0.46
Obs 2	2006/09/05, 15:52:01	2006/09/06, 06:29:22	0.28-0.44
Obs 3	2006/09/28, 05:46:20	2006/09/28, 20:14:43	0.41-0.57

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