1. Max Planck Institute for Solar system Research, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany
2. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
3. Institute for Astrophysics, Georg-August University Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
4. Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
5. Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
6. Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
7. Laboratoire AIM Paris-Saclay, CEA/DRF – CNRS – Université Paris Diderot, IRFU/SAp Centre de Saclay, F-91191 Gif-sur-Yvette Cedex, France
8. Department of Physics, University of Zagreb, Bijenička Cesta 32, 10000 Zagreb, Croatia
9. Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
10. Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Str 1, D-85741 Garching, Germany
11. School of Physics and Astronomy, U. Birmingham, Edgbaston, Birmingham B15 2TT, UK
12. LESIA, PSL Research University, CNRS, Univ. Pierre et Marie Curie, Univ. Denis Diderot, Observatoire de Paris, F-92195 Meudon Cedex, France
13. INAF – Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy
14. Institute for Astrophysics, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna, Austria