Example of LBT K_S spectral fit. Top panel: Spectrum (black), global model (red), and model components of a typical LBT K_S fit (J0942+0422). The continuum power law is shown in blue, the broad and narrow Hβ in magenta and turquoise, the [O III] doublet in orange and violet, and the iron pseudo-continuum in dark grey. The shaded light grey band is affected by poor atmospheric transmission and is not included in the fit. Bottom panel: Global model residuals (green).