1. AGR TRACS International Ltd, Union Plaza, 1 Union Wynd, Aberdeen AB10 1SL, UK
2. Statoil ASA, Arkitekt Ebbells veg 10, Trondheim NO-7005, Norway
3. Department of Geoscience and Petroleum, Norwegian University of Science and Technology, Sem Sælands veg 1, Trondheim, Norway