Open Access
Table 1.
Number of spectra removed in each preprocessing step.
| QS | AR | PF | |||||
|---|---|---|---|---|---|---|---|
| Original number of spectra | 12245756 | 18533706 | 69154121 | ||||
| Spectral line | Mode of removal | ||||||
| Mg II h&k | # spectra removed | % removed | |||||
| Cosmic rays | 660601 | 794857 | 4573446 | 5.4 | 4.3 | 6.6 | |
| Overexposure, min intensity, missing data | 1137748 | 1425111 | 6027484 | 9.3 | 7.7 | 8.7 | |
| Peak pos, peak ratios, high cont. (Mg only) | 403423 | 200664 | 123416 | 3.3 | 1.1 | 0.2 | |
| SAA | 420028 | 987983 | 3735945 | 3.4 | 5.3 | 5.4 | |
| # spectra kept | % of spectra kept | ||||||
| After time clipping | 8284114 | 13292036 | 13778514 | 67.6 | 71.7 | 19.9 | |
| After VAE mask | 0 | 3707476 | 6708590 | 0 | 20.0 | 9.7 | |
| Si IV | # spectra removed | % removed | |||||
| Cosmic rays | 889902 | 1517967 | 9562857 | 7.3 | 8.2 | 13.8 | |
| Overexposure, min intensity, missing data | 10950951 | 12858264 | 25708004 | 89.4 | 69.3 | 37.1 | |
| SAA | 34347 | 292738 | 2170879 | 0.3 | 1.6 | 3.1 | |
| # spectra kept | % spectra kept | ||||||
| After time clipping | 322789 | 3432145 | 7806259 | 2.6 | 18.5 | 11.2 | |
| After intensity mask | 0 | 350166 | 1971573 | 0 | 1.8 | 2.9 | |
| C II | # spectra removed | % removed | |||||
| Cosmic rays | 562050 | 796864 | 5977001 | 4.6 | 4.3 | 8.6 | |
| Overexposure, min intensity, missing data | 10751659 | 11180058 | 16914776 | 87.7 | 60.1 | 24.4 | |
| SAA | 59253 | 479607 | 2982557 | 0.5 | 2.6 | 4.3 | |
| # spectra kept | % spectra kept | ||||||
| After time clipping | 777549 | 5408579 | 10859120 | 6.3 | 29.1 | 15.7 | |
| After intensity mask | 0 | 1174728 | 4368440 | 0 | 6.3 | 6.3 | |
Notes. Number of spectra removed in each preprocessing step. The PF spectra are reduced more than the AR spectra for some lines because of the time clipping of one hour before a flare.
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