Median separation (top three panels) and tilt angle (bottom panel) of 95 EARs with valid measurements of their location at all times from τ = 0.1 to τ = 2.1 days (black curve). This is less than the 153 active regions used in the body of the paper because in this case the EAR is required to have a valid measurement at all time intervals shown. This does not change the results significantly from using all EARs with valid measurements at each time. High- and low-flux observation samples are indicated by the size of the grey circles. Bottom two panels: the coloured curves show the different models of displacement and tilt angle, and grey represents the observations.