[1] Univ Tecn Lisboa, LIP, Lisbon, Portugal
[2] Univ Tecn Lisboa, Inst Super Tecn, Lisbon, Portugal
[3] Univ Turin, Ist Fis Spazio Interplanetario INAF, Turin, Italy
[4] Sezione Ist Nazl Fis Nucl, Turin, Italy
[5] Univ Wisconsin, Madison, WI USA
[6] Fermilab Natl Accelerator Lab, Batavia, IL USA
[7] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil
[8] Univ Paris 07, Lab AstroParticule & Cosmol APC, CNRS IN2P3, Paris, France
[9] Ctr Atom Bariloche, San Carlos De Bariloche, Rio Negro, Argentina
[10] Inst Balseiro CNEA UNCuyo CONICET, San Carlos De Bariloche, Rio Negro, Argentina
[11] NYU, New York, NY USA
[12] Ohio State Univ, Columbus, OH 43210 USA
[13] Univ Tecnol Nacl, Fac Reg Buenos Aires, Buenos Aires, DF, Argentina
[14] UNSAM, CONICET, CNEA, Inst Tecnol Detecci & Astroparticulas, Buenos Aires, DF, Argentina
[15] Univ Nacl Autonoma Mexico, Mexico City 04510, DF, Mexico
[16] Univ Santiago de Compostela, Santiago De Compostela, Spain
[17] Univ Estadual Campinas, IFGW, Campinas, SP, Brazil
[18] Univ Naples Federico II, Naples, Italy
[19] Sezione Ist Nazl Fis Nucl, Naples, Italy
[20] Radboud Univ Nijmegen, IMAPP, NL-6525 ED Nijmegen, Netherlands
[21] Univ Wisconsin, Milwaukee, WI 53201 USA
[22] Rudjer Boskovic Inst, Zagreb 10000, Croatia
[23] Univ Nacl La Plata, IFLP, La Plata, Buenos Aires, Argentina
[24] Consejo Nacl Invest Cient & Tecn, La Plata, Buenos Aires, Argentina
[25] Univ Complutense Madrid, Madrid, Spain
[26] Univ Paris 06, LPNHE, CNRS IN2P3, Paris, France
[27] Univ Paris 07, LPNHE, CNRS IN2P3, Paris, France
[28] Karlsruhe Inst Technol, Inst Expt Kernphys IEKP, D-76021 Karlsruhe, Germany
[29] Univ Grenoble 1, LPSC, INPG, CNRS IN2P3, Grenoble, France
[30] Observ Pierre Auger, Malargue, Argentina
[31] Comis Nacl Energia Atom, Malargue, Argentina
[32] Univ Siegen, D-57068 Siegen, Germany
[33] Univ Politehn Bucuresti, Bucharest, Romania
[34] Karlsruher Inst Technol, Inst Prozessdatenverarbeitung & Elekt, Karlsruhe, Germany
[35] Univ Adelaide, Adelaide, SA, Australia
[36] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, RJ, Brazil
[37] Univ Paris 11, LAL, CNRS IN2P3, Orsay, France
[38] Univ Estadual Sudoeste Bahia, Vitoria Da Conquista, BA, Brazil
[39] Univ Maryland, College Pk, MD 20742 USA
[40] Karlsruhe Inst Technol, Inst Kernphys, D-76021 Karlsruhe, Germany
[41] Univ New Mexico, Albuquerque, NM 87131 USA
[42] Berg Univ Wuppertal, Wuppertal, Germany
[43] Univ Nantes, CNRS IN2P3, Ecole Mines Nantes, SUBATECH, Nantes, France
[44] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[45] Univ Alcala, Madrid, Spain
[46] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic
[47] Univ Roma Tor Vergata, I-00173 Rome, Italy
[48] Sezione Ist Nazl Fis Nucl, Rome, Italy
[49] Univ Fed Rio de Janeiro, Inst Fis, Rio De Janeiro, RJ, Brazil
[50] Inst Nucl Phys PAN, Krakow, Poland