[1] Univ Politecn Valencia, Inst Invest Gestio Integrada Zones Costaneres IGI, E-46730 Gandia, Spain
[2] Aix Marseille Univ, CPPM, CNRS, IN2P3, Marseille, France
[3] Inst Univ Technol Colmar, GRPHE, F-68008 Colmar, France
[4] Tech Univ Catalonia, Lab Appl Bioacoust, E-08800 Barcelona, Spain
[5] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy
[6] Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[7] CEA Saclay, Serv Elect Detecteurs & Informat, Direct Sci Mat, Inst Rech Lois Fondamentales Univers, F-91191 Gif Sur Yvette, France
[8] Nikhef, Amsterdam, Netherlands
[9] Univ Paris 07, Lab AstroParticule & Cosmol, Observ Paris, APC,CNRS,CEA,UMR 7164, F-75205 Paris 13, France
[10] LAM, F-13388 Marseille 13, France
[11] Ist Nazl Fis Nucl, Sez Bologna, I-40127 Bologna, Italy
[12] Univ Bologna, Dipartimento Fis, I-40127 Bologna, Italy
[13] Univ Valencia, CSIC, IFIC, Inst Fis Corpuscular, E-46071 Valencia, Spain
[14] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy
[15] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[16] Univ Blaise Pascal, Clermont Univ, Phys Corpusculaire Lab, CNRS,IN2P3, F-63000 Clermont Ferrand, France
[17] Univ Nice Sophia Antipolis, Geoazur, Observ Cote Azur, CNRS,INSU,IRD, F-06235 Villefranche Sur Mer, France
[18] Univ Paris 06, F-06235 Villefranche Sur Mer, France
[19] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
[20] Ist Nazl Fis Nucl, LNS, I-95123 Catania, Italy
[21] CNRS, INSU, COM, F-13288 Marseille 9, France
[22] Univ Mediterranee, F-13288 Marseille 9, France
[23] Univ Paris 11, F-91405 Orsay, France
[24] Univ Groningen, KVI, NL-9747 AA Groningen, Netherlands
[25] CEA Saclay, Direct Sci Mat, Inst Rech Lois Fondamentales Univers, Serv Phys Particules, F-91191 Gif Sur Yvette, France
[26] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[27] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy
[28] Univ Mohammed 1, Lab Phys Matter & Radiat, Oujda 6000, Morocco
[29] NIOZ, Royal Netherlands Inst Sea Res, NL-1797 SZ T Horntje, Texel, Netherlands
[30] Univ Erlangen Nurnberg, Dr Remeis Sternwarte, D-96049 Bamberg, Germany
[31] Univ Erlangen Nurnberg, ECAP, D-96049 Bamberg, Germany
[32] Univ Utrecht, Fac Betawetenschappen, NL-3584 CC Utrecht, Netherlands
[33] Univ Amsterdam, Inst Hoge Energie Fys, NL-1098 XG Amsterdam, Netherlands
[34] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia
[35] Ist Nazl Fis Nucl, Sez Catania, I-95125 Catania, Italy
[36] Univ Catania, Dipartimento Fis & Astron, I-95125 Catania, Italy
[37] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland
[38] Inst Space Sci, R-77125 Bucharest, Magurele, Romania
[39] Univ Strasbourg, IPHC, F-67037 Strasbourg 2, France
[40] CNRS, IN2P3, F-67037 Strasbourg 2, France
[41] ITEP, Moscow 117218, Russia
[42] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy
[43] Leiden Univ, NL-2300 RA Leiden, Netherlands
[44] Accademia Navale Livorno, Livorno, Italy