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Fig. 1

image

An approximated spectrum (twenty of the smallest and largest eigenvalues) of an example system matrix derived for the polarisation-sensitive case and preconditioned with different preconditioners. From the bottom to the top, we show the eigenvalues of A, MBDA, and M2lvl, { S,D }A, where M2lvl, { S,D } denotes the two-level preconditioners proposed in Sect. 3.2. The respective condition numbers, κ, are given in the legend.

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