Left: SDSS spectrum of RX J0135−0043, and component decomposition into Fe II complexes, a reddened AGN power‐law continuum, and host galaxy contribution as labeled in the figure. Strong absorption lines from the host galaxy are visible. Right: Zoom onto the Hα and Hβ lines, showing the presence of two narrow cores of each Balmer line (green and light blue lines; note that in this paper, we use positive velocities to indicated blueshifts, and negative values for redshifts), and a broad base (dark blue lines).