1. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, PL-00-716 Warsaw, Poland
2. South African Astronomical Observatory, PO Box 9, Observatory, 7935, Cape Town, South Africa
3. Southern African Large Telescope Foundation, PO Box 9, Observatory, 7935, Cape Town, South Africa
4. Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warszawa, Poland