1. Delft University of Technology, Department of Geosciences, Delft, the Netherlands..
2. Formerly University of Edinburgh, School of GeoSciences, Edinburgh, UK; presently Statoil ASA, Bergen, Norway..
3. Norwegian University of Science and Technology, Department of Petroleum Engineering and Applied Geophysics, Trondheim, Norway..
4. Formerly Schlumberger Gould Research, Cambridge, UK; presently Department of Earth Sciences, Utrecht, the Netherlands..