In-cycle variation of the equatorial rotation velocity, represented by parameter A, and steepness of the differential rotation, represented by B, shown in phase space for SCs 20–24 (1964–2016) and both hemispheres together. Blue and red dots represent our KSO rLSQ and KSO DS values (1964–2016), yellow dots show KSO values from Lustig (1983) (1964–1981), and black, green, and orange dots show DPD, GPR, and SOON/NOAA values from Ruždjak et al. (2017). The red line represents the result of the LOESS, with the greyish part indicating the 95% confidence level. Full phases (0–5) correspond to the times of subsequent minima.