[1] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic
[2] CNEA UNCuyo CONICET, Ctr Atom Bariloche, San Carlos De Bariloche, Rio Negro, Argentina
[3] CNEA UNCuyo CONICET, Inst Balseiro, San Carlos De Bariloche, Rio Negro, Argentina
[4] UTN FRBA, CONICET, Comis Nacl Energia Atom, Ctr Atom Constituyentes, Buenos Aires, DF, Argentina
[5] Univ Buenos Aires, Dept Fis, FCEyN, RA-1053 Buenos Aires, DF, Argentina
[6] Univ Natl La Plata, IFLP, La Plata, Buenos Aires, Argentina
[7] Consejo Nacl Invest Cient & Tecn, La Plata, Buenos Aires, Argentina
[8] Consejo Nacl Invest Cient & Tecn, Inst Astron & Fis Espacio, RA-1033 Buenos Aires, DF, Argentina
[9] UTN FRM, Mendoza, Argentina
[10] Pierre Auger So Observ, Malargue, Argentina
[11] Comis Nacl Energia Atom, Malargue, Argentina
[12] Univ Adelaide, Adelaide, SA, Australia
[13] Univ Catolica Bolivia, La Paz, Bolivia
[14] Univ Mayor San Andres, La Paz, Bolivia
[15] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
[16] Pontificia Univ Catolica Rio de Janeiro, Rio De Janeiro, Brazil
[17] Univ Sao Paulo, Inst Fis, Sao Carlos, SP, Brazil
[18] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil
[19] Univ Estadual Campinas, IFGW, Campinas, SP, Brazil
[20] Univ Estadual Feira de Santana, Feira De Santana, Brazil
[21] Univ Estadual Sudoeste Bahia, Vitoria Da Conquista, BA, Brazil
[22] Univ Fed Bahia, Salvador, BA, Brazil
[23] Univ Fed ABC, Santo Andre, SP, Brazil
[24] Univ Fed Rio de Janeiro, Inst Fis, Rio De Janeiro, Brazil
[25] Univ Fed Fluminense, Inst Fis, BR-24020 Niteroi, RJ, Brazil
[26] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, Prague, Czech Republic
[27] Palacky Univ, CR-77147 Olomouc, Czech Republic
[28] Univ Paris 11, CNRS, IN2P3, IPNO, F-91405 Orsay, France
[29] Univ Paris 07, CNRS, IN2P3, Lab AstroParticule & Cosmol, Paris, France
[30] Univ Paris 11, CNRS, IN2P3, LAL, F-91405 Orsay, France
[31] Univ Paris 06, CNRS, IN2P3, LPNHE, Paris 05, France
[32] Univ Paris 07, CNRS, IN2P3, LPNHE, Paris 05, France
[33] Univ Grenoble 1, CNRS, IN2P3, LPSC, Grenoble, France
[34] CNRS IN2P3, SUBATECH, Nantes, France
[35] Berg Univ Wuppertal, Wuppertal, Germany
[36] Forschungszentrum Karlsruhe, Inst Kernphys, D-76021 Karlsruhe, Germany
[37] Forschungszentrum Karlsruhe, Inst Prozessdatenverarbeitung & Elekt, D-76021 Karlsruhe, Germany
[38] Max Planck Inst Radioastron, D-5300 Bonn, Germany
[39] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
[40] Univ Karlsruhe TN, IEKP, Karlsruhe, Germany
[41] Univ Siegen, Siegen, Germany
[42] Univ Genoa, Dipartimento Fis, Genoa, Italy
[43] Ist Nazl Fis Nucl, I-16146 Genoa, Italy
[44] Univ Aquila, I-67100 Laquila, Italy
[45] Ist Nazl Fis Nucl, Laquila, Italy
[46] Univ Milan, Milan, Italy
[47] Sezione Ist Nazl Fis Nucl, Milan, Italy
[48] Univ Salento, Dipartimento Fis, Lecce, Italy
[49] Sezione Ist Nazl Fis Nucl, Lecce, Italy
[50] Univ Naples Federico II, Naples, Italy