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The geomagnetic field induces an azimuthal modulation of the estimated energy of cosmic rays up to the ~2% level at large zenith angles. We present a method to account for this modulation of the reconstructed energy. We analyse the effect of the modulation on large scale anisotropy searches in the arrival direction distributions of cosmic rays. At a given energy, the geomagnetic effect","authors_text":"A. Aminaei, A. Anzalone, A. A. Watson, A. Bell\\'etoile, A. Bueno, A. Castellina, A. C. Fauth, A. Chiavassa, A. Chou, A. Cordier, A. Creusot, A. Criss, A. C. Rovero, A. Curutiu, A. Dorofeev, A. D. Supanitsky, A. E. Herve, A. Etchegoyen, A. F. Barbosa, A. Ferrero, A. F. Grillo, A. Filevich, A. Filip\\v{c}i\\v{c}, A. Gascon, A. G. Mariazzi, A. Gorgi, A. Guzman, A. Haungs, A. Horneffer, A. Insolia, A. Italiano, A. Keivani, A. Lemiere, A. Letessier-Selvon, A. Lopez Ag\\\"uera, A. Lucero, A. Menshikov, A. M. van den Berg, A. Nelles, A. Olinto, A. Parra, A. Petrolini, A. P. Ferguson, A. 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Melo, D. Monnier Ragaigne, D. Nitz, D. Nosek, D. Pakk Selmi-Dei, D. Ravignani, D. Schuster, D. Tegolo, D. Thomas, D. Veberi\\v{c}, D. Walz, D. Warner, D. Zavrtanik, E. Arganda, E. D. Fraenkel, E. Grashorn, E. J. Ahn, E. J. Quel, E. Kemp, E. Menichetti, E. Moreno, E. M. Santos, E. Parizot, E. Petermann, E. Roulet, E. Santos, E. Strazzeri, E. Trovato, E. Varela, E. Zas, F. Arqueros, F. Blanco, F. Contreras, F. Gomez Albarracin, F. Guarino, F. Ionita, F. Kuehn, F. Montanet, F. Salamida, F. S\\'anchez, F. Sarazin, F. Schmidt, F. Schr\\\"oder, F. Suarez, G. Avila, G. Cataldi, G. Decerprit, G. De La Vega, G. Farrar, G. Golup, G. la Rosa, G. Marsella, G. Matthiae, G. Medina-Tanco, G. M\\\"uller, G. Navarra, G. Parente, G. P. Guedes, G. Rodriguez, G. Ros, G. R. Snow, G. Salina, G. Sigl, G. Tristram, G. Wieczorek, G. Yuan, H. Asorey, H. Bl\\\"umer, H. Cook, H. Dembinski, H. Falcke, H. Gemmeke, H. Glass, H. H. Silva Lopez, H. J. Mathes, H. Lyberis, H. Martinez, H. O. Klages, H. Rivera, H. R. Marquez Falcon, H. Salazar, H. Schieler, H. Schoorlemmer, H. Spinka, H. Wahlberg, H. Wilczy\\'nski, I. Allekotte, I. C. Maris, I. De Mitri, I. Dutan, I. Fajardo Tapia, I. F. M. Albuquerque, I. Lhenry-Yvon, I. M. Pepe, I. Rodriguez-Cabo, I. Sidelnik, I. Vali\\~no, I. Zaw, J. A. Bellido, J. A. Chinellato, J. A. J. Matthews, J. Allen, J. Alvarez Castillo, J. Alvarez-Mu\\~niz, J. Aublin, J. B\\\"auml, J. Brack, J. C. Diaz, J. C. D'Olivo, J. C. dos Anjos, J. Chauvin, J. Chudoba, J. C. Moreno, J. Coppens, J. Cronin, J. D. Hague, J. Ebr, J. Espadanal, J. F. Vald\\'es Galicia, J. G. Gonzalez, J. J. Beatty, J. K. Kulbartz, J. Kleinfeller, J. Knapp, J. L. Harton, J. L. Kelley, J. L. Navarro, J. Lozano Bahilo, J. Marin, J. Matthews, J. Neuser, J. Oehlschl\\\"ager, J. Pallotta, J. P\\c{e}kala, J. Petrovic, J. Rautenberg, J.R. H\\\"orandel, J. Ridky, J. Roberts, J. Rodriguez Martino, J. Rodriguez Rojo, J. Rosado, J. R. T. de Mello Neto, J. R. V\\'azquez, J. Schovancova, J. Sorokin, J. Stapleton, J. Stasielak, J. Swain, J. Tiffenberg, J. Vicha, K. B. Barber, K. Daumiller, K. D. de Vries, K. Gesterling, K. H. Becker, K. H. Kampert, K. Kadija, K. Kotera, K. Link, K. Louedec, K. S. Caballero-Mora, K. Weidenhaupt, L. Anchordoqui, L. Caramete, L. Cazon, L. Del Peral, L. Lu, L. Martin, L. Miramonti, L. Molina-Bueno, L. Nellen, L. Niemietz, L. No\\v{z}ka, L. Perrone, L. Valore, L. Villase\\~nor, L. Wiencke, M. Aglietta, M. A. Leigui de Oliveira, M. Ambrosio, M. A. Muller, M. Ave, M. Avenier, M. Balzer, M. Blanco, M. Boh\\'a\\v{c}ov\\'a, M. C. Maccarone, M. De Domenico, M. del R\\'io, M. D. Rodr\\'iguez-Fr\\'ias, M. Erdmann, M. Giller, M. G\\'omez Berisso, M. Grigat, M. G. Winnick, M. Hrabovsk\\'y, M. I. Micheletti, M. J. Cooper, M. Josebachuili, M. Kleifges, M. L. D\\'iaz Castro, M. Ludwig, M. Melissas, M. Monasor, M. Mostaf\\'a, M. M\\\"unchmeyer, M. Nyklicek, M. Ortiz, M. Palatka, M. Pech, M. Pimenta, M. Platino, M. Pontz, M. Prouza, M. R. Coluccia, M. Risse, M. Roth, M. S. A. B. Le\\~ao, M. Scuderi, M. Settimo, M. S. Gold, M. S. Sutherland, M. Stephan, M. Szuba, M. Tartare, M. T. Dova, M. Tueros, M. Unger, M. Urban, M. Videla, M. Weber, M. Will, M. Wommer, M. Zavrtanik, M. Zimbres Silva, M. Ziolkowski, N. Borodai, N. Dhital, N. Fazzini, N. Griffith, N. Hollon, N. Krohm, N. Kunka, N. Nierstenhoefer, N. Pacheco, N. Palmieri, N. Phan, N. Scharf, N. T. Thao, O. Catalano, O. Deligny, O. Kr\\\"omer, O. Mart\\'inez Bravo, O. Ravel, O. Scholten, O. Ta\\c{s}c\\u{a}u, O. Wainberg, P. Abreu, P. Allison, P. Assis, P. Billoir, P. Brogueira, P. Buchholz, P. Facal San Luis, P. Gon\\c{c}alves, P. Gouffon, P. Hansen, P. Homola, P. Karhan, P. Kasper, P. Lautridou, P. L. Biermann, P. Lebrun, P. L. Ghia, P. Mantsch, P. Mertsch, P. N. Diep, P. N. Dong, P. Necesal, P. Oliva, P. O. Mazur, P. Petrinca, P. Pieroni, P. Privitera, P. Ristori, P. Schiffer, P. Schov\\'anek, P. Sommers, P. T. Nhung, P. Travnicek, P. Wahrlich, P. Younk, R. A. V\\'azquez, R. Bardenet, R. Bonino, R. Bruijn, R. Caruso, R. Cester, R. Concei\\c{c}\\~ao, R. C. Shellard, R. Dallier, R. D. Parsons, R. E. Burton, R. Engel, R. F. Gamarra, R. Gaior, R. L\\'opez, R. M. de Almeida, R. M. Kieckhafer, R. Mussa, R. Pelayo, R. Pesce, R. Piegaia, R. Sato, R. Squartini, R. Tcaciuc, R. Ulrich, R. \\v{S}m\\'ida, R. W. Clay, S. Andringa, S. BenZvi, S. Coutu, S. Dagoret-Campagne, S. Dasso, S. Fliescher, S. Gambetta, S. Grebe, S. Harmsma, S. H. Cheng, S. J. de Jong, S. Jiraskova, S. J. Sciutto, S. L. C. Barroso, S. Maldera, S. Mi\\'canovi\\'c, S. Mollerach, S. Mueller, S. Navas, S. Pastor, S. Petrera, S. Querchfeld, S. R. Gozzini, S. Riggi, S. Sarkar, S. Schulte, S. Stanic, S. Westerhoff, T. Anti\\v{c}i\\'c, T. B\\\"acker, T. Hebbeker, T. Huege, T. Paul, T. Pierog, T. Rossler, T. Suomij\\\"arvi, T. \\v{S}u\\v{s}a, T. Winchen, T. Yamamoto, T. Yapici, U. Fr\\\"ohlich, U. Giaccari, V. C. Holmes, V. de Souza, V. H. Ponce, V. Marin, V. M. Olmos-Gilbaja, V. Pirronello, V. Rizi, V. Scherini, V. Verzi, W. C. 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