1. Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500 GL Nijmegen, The Netherlands
2. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, The Netherlands
3. Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
4. NOVA Optical InfraRed Instrumentation Group, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, The Netherlands