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Fig. 3

image

Convergence behavior for MALI (red) and multigrid with three (blue) and four (purple) grids for the three-level Ca ii atom within atmosphere Model 1. The computing time is expressed in units of the time it takes to perform one MALI iteration at the finest grid. The multigrid computations were performed with ν1 = 2, ν2 = 2, ν3 = 32, full-weighting restriction and trilinear interpolation.

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