Fig. 4.
Radial magnetic field at the surface as a function of time from the solutions in the advection-dominated regime (ADV, top panel) and the diffusion-dominated regime (DIFF, bottom panel). Contours also represent Br, but show the 15, 1.5, and 0.15% levels of 
for the top panel (ADV) and the 50, 25, and 10% levels of 
for the bottom panel (DIFF). The parameters are summarized in Table 1.
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