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Fig. 1


Top panel: spectra of some pairs of the standard stars observed during the night of 2011 January 08 divided by a pair of Landolt (SA) 102−1081 observed at an airmass of 1.25. Bottom panel: same for the night of 2011 January 09 taking a pair of Landolt (SA) 102−1081 at an airmass of 1.41 as a reference. The airmass of each standard is included in the legend and the spectra are shifted by 0.5 in the vertical for clarity.

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