MUSE opto-mechanical design and performance par Hénault, F, Bacon, R, Dekker, H, Delabre, B, Djidel, S, Dubois, J, Hubin, N, Lantz, B, Lau, W, Le Louarn, M, Lewis, I, Lizon, J, Lynn, J, Pasquini, L, Reiss, R, Roth, M