Convergence behavior of multigrid, showing the maximum relative error and the maximum relative error estimated by Eq. (18) for each V-cycle, as well as the maximum relative change in population per V-cycle. Upper panels: three-level Ca ii atom; lower panels: H i, both for atmosphere Model 1. For three-level Ca ii we used ν1 = 2, ν2 = 2, ν3 = 32 and for H i, we used ν0 = 15, ν1 = 2, ν2 = 25, ν3 = 32.
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