[1] Tech Univ Munich, D-80290 Munich, Germany
[2] Univ Szeged, Szeged, Hungary
[3] Univ Siena, I-53100 Siena, Italy
[4] Politecn Milan, I-20133 Milan, Italy
[5] Univ Saarland, D-66123 Saarbrucken, Germany
[6] Elettra Sincrotrone Trieste SCpA, Basovizza, Italy
[7] Univ Szeged, Szeged, Hungary
[8] Univ Murcia, E-30001 Murcia, Spain
[9] Univ Bergamo, Bergamo, Italy
[10] Karlsruhe Inst Technol, D-76021 Karlsruhe, Germany
[11] Univ Antwerp, Antwerp, Belgium
[12] Warsaw Univ Technol, PL-00661 Warsaw, Poland
[13] ESRF, Grenoble, France
[14] Debrecen Univ, Debrecen, Hungary
[15] Politecn Milan, Dipartimento Matemat F Brioschi, I-20133 Milan, Italy
[16] Dipartimento Matemat & Informat U Dini, I-50134 Florence, Italy
[17] Leiden Univ, LIACS, NL-2333 CA Leiden, Netherlands
[18] Univ Colorado, Dept Comp Sci, Boulder, CO 80309 USA