The SLIM 1 1 The SLIM collaboration: S. Balestra, S. Cecchini, M. Cozzi, M. Errico, F. Fabbri, G. Giacomelli, R. Giacomelli, M. Giorgini, A. Kumar, S. Manzoor, J. McDonald, G. Mandrioli, S. Marcellini, A. Margiotta, E. Medinaceli, L. Patrizii, J. Pinfold, V. Popa, I.E. Qureshi, O. Saavedra, Z. Sahnoun, G. Sirri, M. Spurio, V. Togo, A. Velarde, A. Zanini. experiment was an array of 427 m 2 of nuclear track detectors (NTDs), exposed at a high altitude laboratory (Chacaltaya, Bolivia, 5230 m a.s.l.), for ∼4.22 years. SLIM was sensitive to downgoing intermediate mass magnetic monopoles with masses of 10 5 GeV/c 2 ≤ M M ≤ 10 12 GeV/c 2. The analysis of the full detector gives a flux upper limit of 1.3 × 10 −15 cm −2 s −1 sr −1 with the 90% Confidence Level (C.L.) for downgoing fast intermediate mass magnetic monopoles.