1. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnlogías, Universidad de Alicante, E-03690 Alicante, Spain
2. IESL, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece
3. Physics Department and Institute of Theoretical and Computational Physics, University of Crete, 70013 Heraklion, Greece
4. Science Operations Department, European Space Astronomy Center (ESAC), E-28629 Villanueva de la Cañada, Madrid, Spain
5. Sternberg Astronomical Institute, Moscow M.V. Lomonosov State University, 119234 Moscow, Russia
6. National Research University Higher School of Economics, Myasnitskaya ul. 20, Moscow 101000, Russia
7. Institute for Physics and Astronomy, Universität Potsdam, D-14476 Potsdam, Germany