**Author details**

Georg Hildenbrand<sup>1</sup> \*, Klaus Paschek1,2, Myriam Schäfer1 and Michael Hausmann<sup>1</sup>

1 Department of Physics and Astronomy, Heidelberg University, Kirchhoff-Institute for Physics, Heidelberg, Germany

2 Max Planck Institute for Astronomy, Heidelberg, Germany

\*Address all correspondence to: hilden@kip.uni-heidelberg.de

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