Examples of one (1c, on the left) and two (2c, on the right) component Gaussian fits to the Hα + [NII] profiles in two different spaxels in IRAS F09022-3615 (top) and IRAS F18093-5744 C (bottom). The χ² for all the Gaussian fittings is shown for a direct comparison. The systemic (narrow) component is shown in green, while the broad one is shown in light blue. The red curve shows the total contribution coming from the Hα + [NII] Gaussian fit. Below, the residuals (i.e., data – model) are presented: they clearly show when two components are needed to properly fit asymmetric line profiles. The standard deviation value of the residuals (i.e., ±1σ) is shown using dashed lines.