1. Department of Optics and Quantum Electronics, Institute of Physics, University of Szeged, H-6720 Szeged, Dóm tér 9, Hungary
2. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17, Hungary
3. MTA-ELTE Lendület Milky Way Research Group, Hungary