1. Institute for Nuclear Research (Atomki), PO Box 51, Debrecen H-4026, Hungary
2. Centre for Astrophysics and Planetary Science, School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom
3. School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, United Kingdom
4. Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica SK-059 60, Slovakia
5. INAF Osservatorio Astronomico di Roma, Monte Porzio Catone RM-00078, Italy
6. Department of Physics and Astronomy, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
7. Department of Physics, Faculty of Mechanical Engineering and Informatics, University of Miskolc, Miskolc H-3515, Hungary