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Fig. 19.

image

Top: spectrum of NGC 2110 extracted from the stacking of spectra obtained for 50 ScW sets in the time periods used in Lubiński et al. (2016) using OSA 10.2. Bottom: comparison of the spectra of NGC 2110 extracted from the stacking of spectra obtained for 50 ScW sets in the time periods used in Ursini et al. (2019) and the spectra published in Ursini et al. (2019). The spectra can be regenerated online using the notebook spectrum_longterm.ipynb and spectrum_longterm_Ursini19.ipynb.

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