Speed-up (left-hand panel) and spectral radius (right-hand panel) of multigrid as a function of the number of V-cycles. The computations were performed using column x = 0,y = 271 from Model 1 as a 1D atmosphere and the three-level Ca ii model atom. The different colors indicate a different number of post-smoothing iterations ν2. The other multigrid parameters are: three grids, ν1 = 2, ν3 = 32, linear interpolation, and full-weighting restriction.
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