Top: optical spectrum of 2339−0912 (the black solid line) and its model spectrum components. The optical spectrum includes several emission lines such as Hγ, Hβ, and [O III]. The red dashed line indicates the fitted continuum spectrum that is composed of a power-law component (green dotted line) and a component for the Fe blends (blue dot-dashed line). Bottom: the continuum-subtracted spectrum showing broad Balmer emission lines. The continuum-subtracted spectra are used for fitting the lines.