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Table 1

Summary of ExPo observations.

Target Date No Exp. Total Exp. Time Seeing
[s]  [′′] 

Z CMa 30 Dec. 2009 4 × 18 000 2016 1.51
04 Jan. 2010 4 × 20 600 2307 1.44
G 91-23 31 Dec. 2009 4 × 4095 458.64 0.95

Notes. The exposure time for each single frame was 0.028 s in all cases. No filter was used in any of these observations. G 91-23 is an unpolarized, diskless star.

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