Snapshots of the CMEs in the single eruption cases, propagating in the slow (top row) and faster (bottom row) background solar winds. The first column shows the CMEs when the front of the flux ropes are at ≈35 R_⊙, and the second column when they reach 1 AU. Each snapshot was taken at the times indicated in the respective panels, counted from the start of shearing. The colour scale depicts plasma β values, and the white lines represent selected magnetic field lines.