Final calibrated spectrum of J0038–1527. The black and gray lines represent the Galactic extinction corrected spectrum and error vector. The thin magenta line denotes the quasar composite spectrum constructed with ∼200 Sloan Digital Sky Survey (SDSS) quasars with large C IV blueshifts. The green dashed line denotes the pseudo-continuum, which includes power-law, Fe II emission, and Balmer continuum. The orange circles are flux-density converted from galactic extinction corrected magnitudes listed in Table 1. The x-axis error bars of the two leftmost orange circles denote the FWHMs of z_DELS and y_ps1 filter curves. Two inner plots show spectral fitting of C IV (a) and Mg II (b) regions, respectively. The blue dotted–dashed line denotes the best-fit power-law continuum, the green dashed line denotes the best-fit pseudo-continuum. The cyan line denotes fitted C IV and Mg II emission lines plus power-law continuum, and the red line denotes the total fitted flux.