Mean latitudinal flow ⟨ u_θ ⟩ as a function of latitude and time at A) the top layers (r = 0.95 R_⊙) and B) near the base of the CZ (r = 0.72 R_⊙). For a better contrast, in panel B the displayed quantity is actually 2⟨ u_θ ⟩. The black contour lines represents ⟨ B_φ ⟩ (solid and dashed for positive and negative polarities respectively). The horizontal solid line represents the latitude at which panel C is sampled. The time interval covers cycles 23 to 28. The color scale saturates at ± 3 m s^-1 (red northward, blue southward). Panel C is a radius vs. latitude plot of ⟨ u_θ ⟩ taken at 65° north. Both ⟨ u_θ ⟩ and ⟨ B_φ ⟩ are smoothed over 6 months. The vertical dotted lines represent the maximum and minimum of cycle 25. The dashed line marks the tachocline depth, the dotted line below it is the depth where ⟨ B_φ ⟩ contours are computed and the solid line is the depth where panel B is sampled.