1. South African Astronomical Observatory, PO Box 9, Observatory, 7935, South Africa
2. Southern African Large Telescope Foundation, PO Box 9, Observatory, 7935, South Africa
3. Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
4. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00716 Warsaw, Poland