As Fig. 3 but now overplotting orbits integrated in the best fitting spherical potential to halo Aq-A (top panels) and halo Aq-D (bottom panels). The orientation of the streams has been changed such that the z-direction corresponds with the mean angular momentum of the particles. The plotted orbit is that of a particle (indicated with a red cross) near or in the bound part of the progenitor and has been evolved 4 Gyr forward and backwards in time assuming a static spherical potential.