Residual moment-0 and moment-1 maps from ^3DBAROLO fitting and the S/N map of the emission using the source plane error map (i.e., source plane intensity/moment-0 divided by the source plane intensity error map) as described in Sect. 3.3.3. Note: the first two panels are a zoomed-in version of the same images shown as in Fig. 7 (rows 1 and 2, column 3), but with a different color scale. The grey grid shows the Voronoi pixels prior to interpolation to the square pixel grid, as described in Sect. 3.3.3. The black line shows the caustic line and the white ellipse shows the region used for ^3DBAROLO fitting (i.e., the final ring). As in Fig. 7, any emission outside the fitting region is semi-transparent. The approximate beam, assuming a static magnification factor across the image, is shown in the bottom- left of the image.