Table 3
Parameters of a spectrogram simulation and Spectractor estimations, recovered with a full forward-model approach.
| Parameter | Simulation value | Recovered value |
|---|---|---|
| x0 (pix) | 743.89 | 743.76 |
| y0 (pix) | 682.92 | 682.93 |
| δy(fit) (pix) | 0 | −0.199 ± 0.003 |
| α (°) | −1.5653 | −1.5654 ± 0.0004 |
| 〈B(r)〉 (ADU s−1) | 0.1930 | 0.1930 |
| DCCD (mm) | 56.322 | 56.329 |
| A2 | 1 | 0.98 ± 0.02 |
| γ0 | 3 | 3.00 ± 0.01 |
| γ1 | 1 | 0.99 ± 0.02 |
| γ2 | 1 | 1.02 ± 0.02 |
| α0 | 3 | 3.01 ± 0.01 |
| α1 | 0 | −0.02 ± 0.01 |
| α2 | 0 | 0.03 ± 0.02 |
| Ndof | 669 | 298 |
| Reduced χ2 | – | 0.53 |
Notes. Parameters with uncertainties are fitted during the Gauss-Newton descent of the full forward model, while others are just estimated on data. The simulation was done with a spectrum made from 669 amplitude parameters, and the regularisation process recovered 303 of them. The δy(fit) centroid correction is included in the y0 quoted value.
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