Fig. 1.
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Calibration stars used for the basic calibration. The labels indicate the identification numbers corresponding to the list of Feldmeier-Krause et al. (2015). The axes show the offset distances from Sgr A* (yellow star) in arcsecond. The background image is from the 2004 June 12 observation corresponding to the IB224 filter. The FoV of the image is ∼42″ × 42″ (∼1.7 pc × 1.7 pc).
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