1. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
2. Univ. Lyon, Univ. Claude Bernard Lyon 1, CNRS, IP2I Lyon/IN2P3, IMR 5822, F-69622 Villeurbanne, France
3. Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
4. OSE Engineering, 1 route de Versailles, F-78470 Saint-Remy-Les-Chevreuses, France