Best-fit result of Model 2 on the ESPRESSO data. The top panel shows the data in gray smoothed with a Gaussian Kernel (σ ≃ 0.07 Å), the best-fit model (black line), and all the emission components identified by different colors: Hγ in gold, Hβ in red, [OIII] in cyan, Fe in light-blue and the continuum in dark blue. The vertical dashed lines indicate, the rest-frame emission wavelength of the Hγ, Hβ, and [OIII]. The bottom panel represents the residuals defined as (data-model)/error, the horizontal dashed black line at the zero level of residuals is plotted to guide the eyes.