The PanCam instrument for the ExoMars rover by Coates, A, Jaumann, R, Griffiths, A, Leff, C, Schmitz, N, Josset, J, Paar, G, Gunn, M, Hauber, E, Cousins, C, Cross, R, Grindrod, P, Bridges, J, Balme, M, Gupta, S, Crawford, I, Irwin, P, Stabbins, R, Tirsch, D, Vago, J, Theodorou, T, Caballo-Perucha, M, Osinski, G, the PanCam Team