Table 1: Summary of the observations.
Telescope Filter exposure seeing ('') airmass
CFHT R 250 s 0.93 1.140
CFHT I 240 s 0.73 1.143
CFHT CN 560 s 0.61 1.150
CFHT TiO 560 s 0.71 1.151
TNG R $2\times 450$ s 1.29 1.26
TNG I $2\times 450$ s 1.10 1.31


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