Results of multiple OH line fits for the SW mosaic. Left column: linewidth (km s⁻¹). Center column: radial velocity offset (km s⁻¹). Right column: flux of the brightest line estimated as intensity times width normalized to the 1D fit median. Top row: median-filtered parameter maps from the 1D fit. Second row from top: regularized maps from the 3D fit. Third row from top: 3D parameter maps minus 3D fit (divided by 1D fit for flux). Bottom row: histograms of difference maps (black histograms) and Gaussian fits to those histograms (red curves). The moments of the Gaussian fits to the histograms are: median µ = −0.82 km s⁻¹ and width σ = 1.38 km s⁻¹ for the linewidth difference; µ = 0.10 km s⁻¹ and σ = 0.95 km s⁻¹ for the line velocity difference; and µ = −1.5% and σ = 2.0% for the relative flux estimate difference.