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Table 2
Convergence rates of formal solvers combined with optical depth conversion schemes.
| Formal solver | Conversion scheme | Continuum | Sr I 4607 | Ca I 4227 | |||
|---|---|---|---|---|---|---|---|
| kI | kQ | kI | kQ | kI | kQ | ||
| DELO-linear | Trapezoidal | 2.00 ± 0.01 | 2.00 ± 0.01 | 1.99 ± 0.01 | 1.96 ± 0.01 | 1.44 ± 0.04 | 1.35 ± 0.03 |
| DELO-linear | Parabolic | 1.40 ± 0.19 | 2.40 ± 0.06 | 2.36 ± 0.23 | 2.59 ± 0.11 | 1.42 ± 0.05 | 1.38 ± 0.03 |
| DELO-linear | Spline | 2.00 ± 0.01 | 1.82 ± 0.03 | 1.99 ± 0.01 | 2.00 ± 0.01 | 1.43 ± 0.05 | 1.38 ± 0.03 |
| DELO-linear | Cubic Hermite | 2.02 ± 0.01 | 1.75 ± 0.05 | 2.07 ± 0.02 | 1.98 ± 0.01 | 1.43 ± 0.05 | 1.38 ± 0.03 |
| DELOPAR | Trapezoidal | 1.99 ± 0.01 | 2.05 ± 0.01 | 1.93 ± 0.02 | 2.12 ± 0.03 | 1.97 ± 0.01 | 2.07 ± 0.01 |
| DELOPAR | Parabolic | 3.06 ± 0.01 | 3.06 ± 0.01 | 3.14 ± 0.03 | 3.18 ± 0.05 | 3.09 ± 0.02 | 3.06 ± 0.07 |
| DELOPAR | Spline | 2.99 ± 0.01 | 3.12 ± 0.01 | 3.00 ± 0.01 | 3.14 ± 0.03 | 2.95 ± 0.05 | 3.06 ± 0.08 |
| DELOPAR | Cubic Hermite | 2.84 ± 0.03 | 3.17 ± 0.03 | 2.77 ± 0.06 | 3.19 ± 0.03 | 2.94 ± 0.05 | 3.06 ± 0.08 |
| DELO-parabolic | Trapezoidal | 2.02 ± 0.01 | 1.97 ± 0.01 | 2.03 ± 0.01 | 1.91 ± 0.01 | 2.02 ± 0.01 | 2.21 ± 0.04 |
| DELO-parabolic | Parabolic | 3.08 ± 0.02 | 3.03 ± 0.01 | 3.23 ± 0.06 | 3.08 ± 0.03 | 3.13 ± 0.03 | 3.32 ± 0.09 |
| DELO-parabolic | Spline | 3.02 ± 0.01 | 2.90 ± 0.03 | 2.97 ± 0.01 | 2.81 ± 0.05 | 3.13 ± 0.07 | 3.56 ± 0.08 |
| DELO-parabolic | Cubic Hermite | 3.13 ± 0.02 | 2.79 ± 0.05 | 3.13 ± 0.01 | 2.62 ± 0.11 | 3.13 ± 0.01 | 3.57 ± 0.08 |
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