1. Physics of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
2. Institute of Fluid Dynamics, Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland
3. Canon Production Printing Netherlands B.V., 5900 MA Venlo, The Netherlands
4. Department of Chemical and Materials Engineering, University of Alberta, T6G 1H9 Edmonton, Alberta, Canada
5. Max Planck Institute for Dynamics and Self-Organisation, 37077 Göttingen, Germany