1. ICRAR, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
2. SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
3. School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA, UK
4. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
5. Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstr. 150, D-44801 Bochum, Germany
6. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn, Germany