Open Access
Table F.2.
GAUSSPY+ keywords mentioned throughout the text.
| Symbol | Description | GAUSSPY+ keyword | Default |
|---|---|---|---|
| Essential parameters | |||
| α1 | First smoothing parameter used in GAUSSPY decomposition (Sect. 2.1) | alpha1 | None |
| α2 | Second GAUSSPY smoothing parameter; only used in two-phase decomposition (Sect. 2.1) | alpha2 | None |
| S/Nmin | Minimum S/N for signal peaks in the data (Sect. 3.2.1) | snr | 3 |
| 𝒮min | Minimum significance value for signal peaks and fitted Gaussian components (Sect. 3.2.1) | significance | 5 |
| More advanced settings | |||
| Δμmax | Maximum difference in offset positions of Gaussian components for grouping (Sect. 3.3.1) | mean_separation | 2 (*) |
| ΔΘmax | Maximum difference in FWHM values of Gaussian components for grouping (Sect. 3.3.1) | fwhm_separation | 4 (*) |
| Θmin | Minimum value for the FWHM of fitted Gaussian components | min_fwhm | 1 (*) |
| Θmax | Maximum value for the FWHM of fitted Gaussian components | max_fwhm | None(*) |
| fa | Factor by which the maximum data value is multiplied to get a maximum limit for the fitted amplitude ai | max_amp_factor | 1.1 |
| fΘ | Factor by which the FWHM value of a fit component has to exceed all other (neighbouring) fit components to get flagged (Sect. 3.2.2) | fwhm_factor | 2 |
| fsep | Factor to determine the minimum required separation between two fit components before they are counted as blended (Sect. 3.2.2) | separation_factor |
 |
| fw | Factor that determines the weight given to neighbouring spectra located at a distance of 1 and 2 pixels (Sect. 3.3.2) | weight_factor | 2 |
| ℱneg. res. peak | Flag criterion for negative residual features (Sect. 3.2.2) | flag_neg_res_peak | True |
| ℱΘ | Flag criterion for broad fit components (Sect. 3.2.2) | flag_broad | True |
| ℱblended | Flag criterion for blended fit components (Sect. 3.2.2) | flag_blended | True |
| ℱresidual | Flag criterion for fit results whose normalised residual values do not pass the tests for normality (Sect. 3.2.2) | flag_residual | True |
| ℱNcomp | Flag criterion for fit results whose number of components are not compatible with neighbouring fits (Sect. 3.2.2) | flag_ncomps | True |
| Npad | Number of spectral channels added to the left and right of signal intervals (Sect. 3.1.2) | pad_channels | 5 (*) |
| Nmin | Minimum number of spectral channels the signal intervals in a spectrum must have (Sect. 3.1.2) | min_channels | 100 (*) |
| ΔNmax | Maximum allowed difference in Ncomp between fit solution and weighted median number of components determined from all immediate neighbours (Sect. 3.2.2) | max_diff_comps | 1 |
| ΔNjump | Maximum allowed difference in Ncomp between individual neighbouring spectra (Sect. 3.2.2) | max_jump_comps | 2 |
| Njump | Maximum number of allowed ΔNjump occurrences for a single spectrum (Sect. 3.2.2) | n_max_jump_comps | 1 |
| PLimit | Probability threshold for features of consecutive positive or negative channels to be counted as more likely to be a noise feature (Sect. 3.1.1, Appendix A) | p_limit | 0.02 |
| p-value | p-value for the null hypothesis that the residual resembles a normal distribution (Sect. 3.3.1) | min_pvalue | 0.01 |
| S/Nmin, fit | Minimum S/N (=ai/σrms) for fitted Gaussian components (Sect. 3.2.1) | snr_fit | None |
| S/Nmin, neg | Minimum S/N for negative peaks in the spectrum (Sect. 3.2.2) | snr_negative | None |
| S/Nspike | S/N threshold for noise spikes (Sect. 3.1.3) | snr_noise_spike | 5 |
| SNR1 | S/N threshold used by GAUSSPY for the original spectrum | snr_thresh | None |
| SNR2 | S/N threshold used by GAUSSPY for the second derivative of the smoothed spectrum | snr2_thresh | None |
| ξ | Minimum number of spectral channels a peak has to contain on either side (Sect. 3.1.4) | order | 6 (*) |
| 𝒲min | Minimum weight threshold before phase 2 of the spatially coherent refitting routine is terminated (Sect. 3.3.2) | min_weight | 0.5 |
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