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Fig. 14.
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Butterfly diagram of solar BL flux-transport model with CS = 30 and Rm = 10, where an α-source term is added. This term is saddled on the tachocline between r1 = 0.67 and r2 = 0.73, with Cα = −15. Respectively, Bϕ at r = 0.7 and Br at the surface. A logarithmic color scale has been chosen to represent both panels.
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