Induction of substructure in Fornax by a massive GC. Top: contours of surface density. The cross indicates the barycenter of the galaxy. The dot indicates the position of the GC. Bottom: ratio of the current surface density to that at the beginning of the simulation. The figure represents a view along a line perpendicular to the orbital plane of the GC. Views of the perturbation from other lines of sight are provided in Appendix D.