We thank the mechanical and electronic workshops of the Universitäts-Sternwarte Göttingen where most of the hardware was designed and constructed. Advice from "La Vision 2D-Meßtechnik'' is gratefully acknowledged.
The Gregory Coudé Telescope is operated by the Universitäts-Sternwarte Göttingen at the Spanish Observatorio del Teide of the Instituto de Astrofísica de Canarias. This work was supported by the Deutsche Forschungsgemeinschaft, through grant Kn 152/16-1,-2.
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