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Perrone, L. Xue, L. Zhang, M. Iacovacci, M.Y. Liu, M. Zha, P. Bernardini, P. Montini, P. Pistilli, P.R. Shen, P. Salvini, P. Vallania, Q.B. Gou, Q.Q. Zhu, Q.Y. Yang, R. Iuppa, R. Santonico, S. Catalanotti, S. Mastroianni, S.M. Mari, S. Vernetto, S.W. Cui, S.Z. Chen, T. Di Girolamo, T.L. Chen, X.C. Yang, X.D. Sheng, X.H. Ma, X.J. Bi, X.X. Zhou, X.Y. Zhang, Y.H. Tan, Y.Q. Guo, Y. Zhang, Z. Cao, Z.G. Yao, Zhaoyang Feng, Zhaxiciren, Zhaxisangzhu, Zhenyong Feng","submitted_at":"2015-11-21T08:05:53Z","abstract_excerpt":"We report on the extensive multi-wavelength observations of the blazar Markarian 421 (Mrk 421) covering radio to gamma-rays, during the 4.5 year period of ARGO-YBJ and Fermi common operation time, from August 2008 to February 2013. In particular, thanks to the ARGO-YBJ and Fermi data, the whole energy range from 100 MeV to 10 TeV is covered without any gap. In the observation period, Mrk 421 showed both low and high activity states at all wavebands. 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