1. Formerly University of Edinburgh, School of GeoSciences, Edinburgh, U. K., and Edinburgh Collaborative of Subsurface Science and Engineering (ECOSSE), U. K.; presently Schlumberger Cambridge Research, Cambridge, U. K. .
2. University of Edinburgh, School of GeoSciences, Edinburgh, U. K., and Edinburgh Collaborative of Subsurface Science and Engineering (ECOSSE), U. K. .
3. WesternGeco, Gatwick, U. K. , , , .
4. Schlumberger Cambridge Research, Cambridge, U. K. .