Fig. 2.
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Mean observed butterfly diagram and poloidal field generation rate. Left panel: Cycle-averaged butterfly diagram from Paper II. Middle panel: Surface radial source term obtained from the left panel by ‘inverting’ a 1D SFT model. Right panel: Surface radial source term obtained from the surface toroidal field (not shown) using an emergence model. See Paper II for more information. The dashed lines represent the location of the maximum surface toroidal field.
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