Spectral analysis of object A. (a) Fitting results for the Hβ-region spectrum of object A. The spectrum is shown in gray, and the continuum and single-Gaussian emission line fits are shown with red dashed and blue dotted lines, respectively. (b) BPT diagram, with the line separating star-forming regions and AGNs from Kewley et al. (2006) shown in black. The red square represents object A, and the red arrow indicates the limit of the ratio.