[1] North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa
[2] Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778582, Japan
[3] Univ Paris Saclay, AIM, Univ Paris Diderot, CEA Paris Saclay,IRFU DAp,CEA,CNRS,Sorbonne Paris, Bat 709, F-91191 Gif Sur Yvette, France
[4] Univ Durham, Ctr Adv Instrumentat, Dept Phys, South Rd, Durham DH1 3LE, England
[5] Ecole Polytech, Lab Leprince Ringuet, Inst Polytech Paris, UMR 7638,CNRS IN2P3, F-91128 Palaiseau, France
[6] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, Granada 18008, Spain
[7] Univ Autonoma Madrid, Inst Fis Teor UAM CSIC, C Nicolas Cabrera 13-15,Campus Cantoblanco UAM, Madrid 28049, Spain
[8] Univ Autonoma Madrid, Dept Fis Teor, C Nicolas Cabrera 13-15,Campus Cantoblanco UAM, Madrid 28049, Spain
[9] Univ Nacl Autonoma Mexico, Ciudad De Mxico 04510, Mexico
[10] Pontificia Univ Catolica Chile, Av Libertador Bernardo OHiggins 340, Santiago, Chile
[11] Univ Geneva, Dept Phys Nucl & Corpusculaire, 24 Rue Gen Dufour, CH-1211 Geneva 4, Switzerland
[12] Univ Aquila, Dipartimento Sci Fis & Chim, Ist Nazl Fis Nucl, Via Vetoio 1,Viale Crispi 7, I-67100 Laquila, Italy
[13] Gran Sasso Sci Inst, Via Vetoio 1,Viale Crispi 7, I-67100 Laquila, Italy
[14] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Cidade Univ,R Matao 1226, BR-05508090 Sao Paulo, SP, Brazil
[15] Osservatorio Astrofis & Sci Spazio Bologna, INAF, Via Piero Gobetti 93-3, I-40129 Bologna, Italy
[16] Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy
[17] Ist Nazl Fis Nucl, Sez Perugia, Via A Pascoli, I-06123 Perugia, Italy
[18] Univ Perugia, Via A Pascoli, I-06123 Perugia, Italy
[19] Aix Marseille Univ, CPPM, CNRS IN2P3, 163 Ave Luminy, F-13288 Marseille 09, France
[20] Czech Acad Sci, FZU, Inst Phys, Na Slovance 1999-2, Prague 18221 8, Czech Republic
[21] Czech Acad Sci, Astron Inst, Bocni II 1401, Prague 14100, Czech Republic
[22] Univ Complutense Madrid, EMFTEL Dept, E-28040 Madrid, Spain
[23] Univ Complutense Madrid, IPARCOS, E-28040 Madrid, Spain
[24] Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, Pl Eugene Bataillon, F-34095 Montpellier 5, France
[25] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
[26] Univ Namibia, Dept Phys, 340 Mandume Ndemufayo Ave,Pioneerspk, Windhoek, Namibia
[27] Monash Univ, Sch Phys & Astron, Melbourne, Vic 3800, Australia
[28] Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland
[29] Osservatorio Astrofis Torino, INAF, Str Osservatorio 20, I-10025 Pino Torineseto, TO, Italy
[30] DESY, Platanenallee 6, D-15738 Zeuthen, Germany
[31] Inst Phys & Chem Res, RIKEN, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[32] Ctr Brasileiro Pesquisas Fis, Rua Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ, Brazil
[33] Univ La Laguna, Inst Astrofis Canarias, Tenerife, Spain
[34] Univ La Laguna, Dept Astrofis, Tenerife, Spain
[35] Linnaeus Univ, Dept Phys & Elect Engn, S-35195 Vaxjo, Sweden
[36] Univ Witwatersrand, 1 Jan Smuts Ave, ZA-2000 Johannesburg, South Africa
[37] Ruhr Univ Bochum, Lehrstuhl Plasma Astroteilchenphys 4, Inst Theoret Phys, Univ Str 150, D-44801 Bochum, Germany
[38] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02180 USA
[39] Ist Nazl Fis Nucl, Sez Torino, Via P Giuria 1, I-10125 Turin, Italy
[40] Univ Turku, Finnish Ctr Astron, ESO, FI-20014 Turku, Finland
[41] NASU, Pidstryhach Inst Appl Problems Mech & Math, 3B Naukova St, UA-79060 Lvov, Ukraine
[42] Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany
[43] Univ Paris, Lab Phys Infinis 2, Irene Joliot Curie, IN2P3,CNRS,Univ Paris Saclay, 15 Rue Georges Clemenceau, F-91406 Orsay, France
[44] Swiss Fed Inst Technol, Inst Particle Phys, Schafmattstr 20, CH-8093 Zurich, Switzerland
[45] Ist Nazl Fis Nucl, Sez Bari, Via Orabona 4, I-70124 Bari, Italy
[46] Politecn Bari, Via Orabona 4, I-70124 Bari, Italy
[47] Barcelona Inst Sci & Technol, Inst Fis Altes Energies IFAE, Campus UAB, Bellaterra 08193, Barcelona, Spain
[48] Osservatorio Astron Palermo GS Vaiana, INAF, Piazza Parlamento 1, I-90134 Palermo, Italy
[49] PSL Univ, Observ Paris, CNRS, LUTH,GEPI, 5 Pl Jules Janssen, F-92190 Meudon, France
[50] PSL Univ, Observ Paris, CNRS, LERMA, 5 Pl Jules Janssen, F-92190 Meudon, France