Fig. 4.
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P200/DBSP spectrum observed in February 2018 (orange) and February 2020 (gray) and the YFOSC spectrum observed in April 2020 (green), January 2021 (red), and May 2021 (cyan) in comparison with the archival SDSS spectrum taken in 2002 (blue). Lower panel: a zoomed-in view of the starlight-subtracted and continuum-subtracted spectra in the Hβ and Hα regions, which are calibrated using the [O III] narrow-line flux.
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