Daily detection stacks reproduced from the CORIMP CME catalog for the SOHO/LASCO observations in the date range 2000 January 01–03. These stacks are generated from the automatically measured CME front heights at every position angle in an image, stacked in time. CMEs appear as groupings of colour-graded pixels, as indicated by the boxed regions. The overlapping CMEs in this time interval are boxed in red, corresponding to the height-time profiles in Figure 4 (that have been put through the cleaning algorithm).