1. Center for Education and Research on Macromolecules, University of Liege, Sart-Tilman, 4000 Liege, Belgium
2. Cold Neutron Research Facility, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
3. Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, New Mexico 84745
4. Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439