Intensity map (left), LOS magnetogram (middle), and Doppler map (right) show the sunspot of AR11841 on the first day (top) of the analysis and six days later (bottom). The position of the maximum horizontal velocity within the spot, within the surroundings, and the radius of the spot are marked by blue, green, and red ellipses, respectively. The arrow in the intensity map points in the direction of disc centre.