Comparison between two modeling techniques for three cases with the Hα emission line observed at z = 0.0726, z = 0.2494 and z = 0.1125. Left panels: continuum subtracted 2D spectra centered at Hα. Middle panels: best-fit models to the emission line with an exponential disc light profile. Right panels: best-fit models to the emission line with the light profile estimated from the algorithm from Scoville et al. (1983). The measurement of the velocity best-fit parameter within its uncertainties is given in the upper right corners. The images scale is: 1 pixel = 0.205″ in the spatial direction and 1 pixel = 0.6 Å in the spectral direction.