Effect of varying S/N on the spectral fits and velocity dispersion maps. The left column shows how the input Gaussian spectrum (gray) is degraded with noise (blue) at different S/N levels (shown at top right corner). In each panel, the resulting Gaussian fit is shown with a dashed red line. The right column shows the resulting velocity dispersion map from degrading the synthetic data cube, with an orange contour picturing the 2σ isophote of the emission.