Fig. 4
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Numerical approximation of Eq. (11) for Q/I (left panels) and U/I (right panels) at μ = 0.07, sampled on the FAL-C spatial grid and plotted in log10(J) scale. Derivatives are computed w.r.t. magnetic field parameters (see titles on each column) for the reference accurate Jacobian (first row), the single-GMRES (second row), and the double-GMRES (third row) approximations.
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