A systematic study of the hybrid experiment at Mt.Chacaltaya M. Tamada, H. Aoki, K. Honda, N. Inoue, N. Kawasumi, N. Martinic, N. Ochi, N. Ohmori, A. Ohsawa, H. Semba and R. Ticona EPJ Web of Conferences, 52 (2013) 07006 Published online: 10 June 2013 DOI: 10.1051/epjconf/20135207006