Table 3
Number of outer GMRES iterations (its) and average number of inner GMRES iterations (itsP), exploiting different preconditioners (P) and a zero-vector initial guess (IG).
| Setting | Ca I4227 | Sr II4077 | Mg II h&k | ||||
|---|---|---|---|---|---|---|---|
| P | IG | its | itsP | its | itsP | its | itsP |
| No | Zero | 53 | – | 45 | – | 248 | – |
| (i) | Zero | 9 | 35 | 7 | 37 | 25 | 110 |
| (ii) | Zero | 7 | 53 | 7 | 45 | 25 | 135 |
| (iii) | Zero | 8 | 45 | 6 | 45 | 7 | 302 |
| (iv) | Zero | 5 | 54 | 4 | 46 | 6 | 337 |
Notes. The labels have the same meanings as in Table 2. Results for the solution of the linear system (4), considering the modeling of the Ca I 4227 Å, Sr II 4077 Å, and Mg II h&k lines, including PRD effects in the general AD case.
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