Left-hand panels: yearly values of Ω₁₇ in units of deg/day in the north (top) and south (bottom) for X-ray flares. Open circles stand for the yearly best-fit values, filled circles demonstrate the 11-point running mean values. The solid horizontal line denotes the average Ω₁₇ over the entire study period, the dashed line the sidereal Carrington rotation rate. Right-hand panels: the same as in the left-hand panels, but for sunspots.