| ... | ... | @@ -971,7 +971,7 @@ integration over cell faces turns out to be too complicated. | 
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The face-averaged magnetic field components are then obtained from the
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integral form of $\mathbf{B}=\nabla\times \mathbf{A}$:
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`g->bx[iz][iy][ix]`$=\left[h_y\Delta_{iy} (h_{zy}\hat{A}_z)
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$\mathtt{g->bx[iz][iy][ix]}=\left[h_y\Delta_{iy} (h_{zy}\hat{A}_z)
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-h_y\Delta_{iz} \hat{A}_y\right]/\delta \mathcal{A}_x$
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`g->by[iz][iy][ix]`$=\left[\Delta_{iz} \hat{A}_x
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