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Based on observations obtained at the 2-m-Alfred Jensch telescope at the Thüringer Landessternwarte Tautenburg, the Harlan J. Smith 2.7 m telescope of McDonald Observatory, and the Hobby-Eberly Telescope (HET). The HET is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München and Georg-August-Universität Göttingen.

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