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New results are presented: at about $1.3{\\times} 10^{19}$ eV, the spectral index changes from $2.51 \\pm 0.03 \\textrm{ (stat.)} \\pm 0.05 \\textrm{ (sys.)}$ to $3.05 \\pm 0.05 \\textrm{ (stat.)}\\pm 0.10\\textrm{ (sys.)}$, evolving to $5.1\\pm0.3\\textrm{ (stat.)} \\pm 0.1\\textrm{ (sys.)}$ beyond $5{\\times} 10^{19}$ eV, while no significant dependence of spectral features on the declination is seen in the accessible range. These features of the spectrum can be reproduced in models with","authors_text":"A. Almela, A.A. Watson, A. Bakalova, A. Balaceanu, A. Blanco, A. Bueno, A. Cancio, A. Castellina, A.C. Cobos Cerutti, A.C. Fauth, A. Coleman, A. Condorelli, A.C. Rovero, A. Di Matteo, A.D. Supanitsky, A. Etchegoyen, A. Filip\\v{c}i\\v{c}, A. Fuster, A. Gherghel-Lascu, A.G. Mariazzi, A. Gorgi, A. Haungs, A. Insolia, A. K\\\"a\\\"ap\\\"a, A. Letessier-Selvon, A.L. Garcia Vegas, A.L. M\\\"uller, A. Lucero, A. Machado Payeras, A.M. Badescu, A.M. Botti, A. Menshikov, A Nucita, A. Parra, A. Puyleart, A. Saftoiu, A. Schulz, A. Streich, A. Taboada, A. Tapia, A. Travaini, A. van Vliet, A. V\\'asquez-Ram\\'irez, A. Weindl, A. Yushkov, A. Zepeda, B. Andrada, B.C. Manning, B. Fick, B. Garc\\'ia, B. Keilhauer, B.L. Lago, B. Pont, B.R. Dawson, B. Tom\\'e, B. Vargas C\\'ardenas, B. Wundheiler, C. Aramo, C. Berat, C. Bleve, C. Bonifazi, C. Di Giulio, C. Dobrigkeit, C.E. Covault, C. Galea, C. Galelli, C. Hojvat, C.J. Todero Peixoto, C. Morello, C.O. Escobar, C. Peters, C. Sarmiento-Cano, C. Sch\\\"afer, C. Timmermans, C. Trimarelli, C. Ventura, D. Boncioli, D. de Oliveira Franco, D. G\\'ora, D. Harari, D. Heck, D. LaHurd, D. Lo Presti, D. Mandat, D. Martello, D. Melo, D. Mockler, D. Nitz, D. Nosek, D. Ravignani, D. Schmidt, D. Stanca, D. Veberi\\v{c}, D. Wittkowski, D. Zavrtanik, E. De Vito, E. Guido, E. Mayotte, E.M. Santos, E. Roulet, E. Santos, E. Varela, E. Zas, F. Barbato, F. Canfora, F. Catalani, F. Contreras, F. Convenga, F. Feldbusch, F. Fenu, F. Gesualdi, F. Gobbi, F. Gollan, F.G. Schr\\\"oder, F. Guarino, F.L. Briechle, F. Montanet, F. Pedreira, F. Riehn, F. Salamida, F. S\\'anchez, F. Sarazin, F. Schl\\\"uter, F. Zuccarello, G.A. Anastasi, G. Avila, G. Cataldi, G.C. Hill, G. Consolati, G. De Mauro, G. Farrar, G. Golup, G. Kukec Mezek, G. Mancarella, G. Marsella, G. Matthiae, G. Medina-Tanco, G. Parente, G.P. Guedes, G. Rodriguez Fernandez, G. Salina, G. Sigl, G. Silli, G. Torralba Elipe, H. Asorey, H. Dembinski, H. Falcke, H. Gemmeke, H.J. Mathes, H. Martinez, H.O. Klages, H. Salazar, H. Schieler, H. Wahlberg, H. Wilczy\\'nski, I. Allekotte, I. Caracas, I.C. Mari\\c{s}, I. De Mitri, I.D. Vergara Quispe, I. Epicoco, I. Goos, I. Lhenry-Yvon, I. Vali\\~no, J.A. Bellido, J.A. Chinellato, J.A. Day, J.A. Johnsen, J. Alvarez Castillo, J. Alvarez-Mu\\~niz, J. Biteau, J. Blazek, J. Brack, J.C. D'Olivo, J. Chudoba, J. Debatin, J. de Jes\\'us, J. de Oliveira, J.D. Sanabria Gomez, J. Ebr, J. Farmer, J.F. Soriano, J.F. Vald\\'es Galicia, J. Glombitza, J. Hulsman, J. Jurysek, J. Kemp, J. Kleinfeller, J.M. Albury, J. Manshanden, J. Matthews, J.M. Carceller, J.M. Figueira, J. Pallotta, J. Pe\\~na-Rodriguez, J. Perez Armand, J.P. Gongora, J. P\\k{e}kala, J. Rautenberg, J.R. H\\\"orandel, J. Ridky, J. Rodriguez Rojo, J.R.T. de Mello Neto, J. Souchard, J. Stasielak, J. Vicha, J. Vink, J. \\v{S}up\\'ik, K. Choi, K. Daumiller, K.-D. Merenda, K.H. Becker, K.H. Kampert, K. Mulrey, K.S. Caballero-Mora, L. Anchordoqui, L.A. N\\'u\\~nez, L. Bonneau Arbeletche, L. Caccianiga, L. Calcagni, L. Cazon, L. Chytka, L. Lopes, L. Miramonti, L. Nellen, L. No\\v{z}ka, L. Perrone, L. Vaclavek, L. Valore, L. Villase\\~nor, L. Wiencke, L. Zehrer, M. Aglietta, M.A. Leigui de Oliveira, M.A. Muller, M. Boh\\'a\\v{c}ov\\'a, M. Buscemi, M. Cerda, M. del R\\'io, M.E. Bertaina, M. Erdmann, M. Giammarchi, M. Giller, M. G\\'omez Berisso, M. Gottowik, M. Hrabovsk\\'y, M.I. Micheletti, M.J. Roncoroni, M. Kleifges, M. K\\\"opke, M.L. D\\'iaz Castro, M. Malacari, M. Mastrodicasa, M.M. Freire, M. Mostaf\\'a, M. Muzio, M. Niculescu-Oglinzanu, M. Niechciol, M. Palatka, M. Pech, M. Perlin, M. Pimenta, M. Platino, M. Pothast, M.P. Panetta, M. Prouza, M.R. Coluccia, M. Reininghaus, M.R. Hampel, M. Risse, M. Roth, M. Schimassek, M. Schimp, M. Scornavacche, M. Stadelmaier, M. Su\\'arez-Dur\\'an, M.T. Dova, M. Trini, M. Tueros, M. Unger, M. Urban, M. Vacula, M. Weber, M. Wirtz, M. Zavrtanik, M. Ziolkowski, N. Borodai, N. Dhital, N. Fazzini, N. Gonz\\'alez, O. Deligny, O. Mart\\'inez Bravo, O. Scholten, O. Sima, O. Tkachenko, O. Zapparrata, P. Abreu, P. Assis, P. Buchholz, P.F. G\\'omez Vitale, P.G. Isar, P. Hansen, P.H. Nguyen, P. Horvath, P.L. Biermann, P.L. Ghia, P. Mantsch, P.O. Mazur, P. Papenbreer, P. Privitera, P.R. Ara\\'ujo Ferreira, P. Ristori, P. Ruehl, P. Savina, P. Schov\\'anek, P. Sommers, P. Stassi, P. Tobiska, P. Travnicek, Q. Dorosti, Q. Luce, R. Alves Batista, R. Caruso, R.C. dos Anjos, R. Colalillo, R. Concei\\c{c}\\~ao, R.C. Shellard, R. Engel, R.G. Lang, R. Halliday, R.J. Barreira Luz, R. L\\'opez, R. Lorek, R.M. de Almeida, R. Mussa, R. Pelayo, R. Sarmento, R. Sato, R. Squartini, R. Ulrich, R. \\v{S}m\\'ida, R.W. Clay, S. Andringa, S. Buitink, S. Dasso, S. Hahn, S.J. De Jong, S.J. Saffi, S.J. Sciutto, S. Marafico, S. Michal, S. Mollerach, S. Petrera, S. Querchfeld, S. Schr\\\"oder, S. Stani\\v{c}, S. Vorobiov, T. Bister, T. Bretz, T.D. Grubb, T. Fodran, T. Fujii, T. Hebbeker, The Pierre Auger Collaboration: A. Aab, T. Huege, T. Pierog, T. Sudholz, T. Suomij\\\"arvi, T. Winchen, U. Giaccari, V. de Souza, V. Lenok, V.M. Harvey, V. Novotny, V. Pirronello, V. Rizi, V. Scherini, V. Verzi, W.M. Namasaka, W. Rodrigues de Carvalho, X. Bertou, Z. 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