Refitted Velocity and flux maps of the Hα emission line for MR 2251-178, identical in content to Figure 2. The first row (a)(b) uses the result with the median velocity of all neighboring spectra as the initial guess for the emission-line fit. The second row (c)(d) uses the result of the neighboring spectrum with minimum ﹩{\chi }_{{\rm{red}}}^{2}﹩ as the initial guess.