1. Hartree
Centre, STFC Daresbury Laboratory, Scientific Computing Department, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington WA4 4AD, U.K.
2. Centre
for Computational Science, Department of Chemistry, University College London, 20 Gordon Street, London, U.K.
3. Sun
Chemical Ltd., St. Mary Cray Technical Centre, Cray Avenue, St. Mary Cray, Orpington, Kent BR5 3PP, U.K.
4. Department
of Earth Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE, U.K.