Ratio of the broad Hβ flux to narrow [O III] λ5007 flux, R_{Hβ/[O III]}, as a function of time for the 2020–2023 spectra. The ratio is plotted using the round blue marker. The dashed blue line represents the approximate trend. The upper limit to R_{Hβ/[O III]} from the archival 6dF spectrum is plotted as the dashed red line. The solid horizontal lines denote the boundaries between Seyfert subtypes following Winkler (1992).