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Table 4.
Summary of the different tests conducted in this work.
| Factor | Test | Result |
|---|---|---|
| LSF broadening accuracy (Sect. 4.3) | Experiment with perturbed broadening within the LSF uncertainty | Insignificant effect |
| Wavelength calibration accuracy (or line-list completeness) (Sect. 4.3) | Experiment with shifted wavelengths | Minor effect on τ([Fe/H]) |
| Interpolation schema (Sect. 4.4) | Compare analyses with linear, quadratic, and cubic interpolations | Results with cubic interpolation are marginally more precise. Artefacts with linear interpolation. |
| Grid choice (Sect. 5.1) | Compare analyses with the GSL and AP18 grids | Results are consistent, but the precision with AP18 is marginally better |
| [α/Fe] of the reference spectra (Sect. 5.1) | Use reference grids with different [α/Fe] | Significant degeneracy between [Fe/H]e and [α/Fe] |
| Mesh size of the grid of reference spectra (Sect. 5.2) | Compare solutions with full and half density grids extracted from AP18 | Minor effects with linear interpolation, insignificant effects otherwise |
| Micro-turbulent velocity parameter, ξ (Sect. 5.3) | Compare solutions with AP18 grids with ξ = 1 and 2 km s−1 | Minor effect on τ([Fe/H]) |
| Wavelength range (Sect. 6.1) | Compare analyses with the full MUSE range, and with the optical region only | Significant degradation of the precision when the range is trimmed; bias on ⟨[Fe/H]⟩; different behaviour with the two grids |
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