1. Technische Universität München, Physik-Department, Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany
2. Institute of Macromolecular Chemistry, Czech Academy
of Sciences, v. v. i.,
Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
3. European Molecular
Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany