Accelerating linear system solvers for time-domain component separation of cosmic microwave background data

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Fig. 5.

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Comparison of the PCG with different choices of initial guess (as in Eqs. (33) and (37)) and the PCG with the subspace recycling (together with the choice of the initial guess as in Eq. (37)). For the recycling we consider k = 10 eigenvectors approximated using dim_p = 100.

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