Fits of the spectral type composite spectrum A2 for four spectral sub-types: A2b0: broad line and weak [OIII]; A2b1: broad line and strong [OIII]; A2n0: narrow line and weak [OIII]; A2n1: narrow line and strong [OIII]. The original spectrum is shown superimposed to the adopted continuum (thick black line) and to Fe II emission (thin green line). The Hβ_BC fitting functions are shown in black and gray (the blue shifted component). The long-dashed purple lines are the fits. Dashed vertical lines identify the rest-frame wavelengths of Hβ and [OIII]. The lower panels show the residuals to the fits.