Panel a: comparison of the cycle periods P_cycl (black) and P̃_cycl (orange) with predicted cycle periods using a Parker–Yoshimura dynamo wave P_PY (blue) for Runs M4 to M15. The dashed blue line indicates a power law fit to P_PY. Panel b: contributions to the Parker– Yoshimura dynamo wave containing the radial shear (black line; left y-axis) and α_φφ (red; right y-axis) for Runs M4 to M15. The dashed lines indicate the corresponding power law fits.