Numerical solutions to linear transfer problems of polarized radiation - IV. Efficient preconditioning in a physics-based framework

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Table 5

Number of outer GMRES iterations (its) and average number of inner GMRES iterations (itsP), exploiting different preconditioners (P) and different initial guesses (IG).

Setting		Ca I	4227	Sr II	4077	Mg II	h&k

P	IG	its	its_P	its	its_P	its	its_P
No	Zero	53	–	45	–	248	–
(i)	(i)	8	35	6	37	24	110
(ii)	(ii)	6	53	6	45	24	135
(iii)	(iii)	7	45	5	45	6	303
(iv)	(iv)	4	54	3	46	5	338

Notes. The labels have the same meanings as in Table 2. Results are for the problems considered in Table 3.

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