Resolution effects on the retained energy. Top part: retained energy for run 3S1-hr (solid line, high resolution), 3S-mr (dashed line, intermediate resolution) and run 3S1 (dotted line, low resolution). The bottom part shows the energy ratio 3S1-hr/3S1-mr (solid line), 3S1-mr/3S1 (dashed line) and 3S1-hr/3S1 (dash-dotted line). In each case, the data for the higher resolution run has been interpolated to the data output times of the lower resolution run. The spikes at the supernova times are artefacts of the interpolation process at the discontinuities of the functions. The horizontal dashed line indicates equality for comparison. The energy increases similarly for each doubling of resolution. The general functional behaviour is independent of resolution. See text for more details.