Example of nonparametric analysis of a random spaxel of J1430. Left panel: [O III]λλ5459,5007 Å continuum subtracted emission lines, with the observed spectrum shown in blue, the best fit model in black, and the corresponding residuals in grey. The same number of Gaussians (four in this case) with the same kinematics and a flux ratio of 2.98 are fit for each line of the doublet. Right panel: corresponding model of the [O III]λ5007 Å line, obtained from the fit shown in the left panel, with W₈₀ indicated as the pink shaded region, vel₀₅ and vel₉₅ indicated by the pink vertical lines, and the upper (vel₀₂ and vel₉₈) and lower bounds (vel₁₀ and vel₉₀) marked by the dot-dashed vertical gray lines. The dashed vertical black line represents the velocity at the [O III] peak (vel_p).