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#spectralsolver polarisation
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spectralderivative fwbw_difference
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err_div_tolrel 1e-3
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itmin 2
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petsc_options -mech_snes_type anderson -mech_snes_anderson_beta 1.0 -mech_snes_anderson_restart 10 -thermal_snes_type anderson -thermal_snes_anderson_beta 1.0
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