Variation in the rotation rate associated with each torque as a fraction of the current rotation rate per year. The upper (lower) part of the diagram shows a spin-up (spin-down) of the star. The actual change in the rotation rate is shown as a solid black line. The changes associated with the stellar wind and the SDI torque are plotted as dashed red and dotted blue lines, respectively. The variation due to a change in the moment of inertia is shown as the orange line. The background colours indicate the state of the star-disc interaction. States 1 and 2 are shown in purple and green, respectively. The light blue region with a gradient indicates a long-lived phase when the system remains close to the transition between states 1 and 2 and switches frequently between the two states. This model does not reach state 3.