(a) Median flux map of SDSS J0912+1523 from the Gemini spectra, with contours overlaid onto the Voronoi bins. (b) Full spectrum of the central Voronoi bin and the HδA central bandpass, surrounded by blue and red “continuum” bandpasses, as defined by Worthey & Ottaviani (1997). The wavelengths of the [O II]λ3727, [O III]λ4959, and [O III]λ5007 lines are labeled.