Comparison of the masking and subsequent PPXF best-fit for three Voronoi bins of the GIST (top) and NGIST (bottom) fits shown in Figures A.2 and A.3. In each case the original spectrum of the bin is shown as a black line. The emission and sky line masks provided to PPXF are shown as the shaded grey regions. NGIST additionally performs further cleaning of the spectra, and these additional clipped regions are shown as shaded red regions. The best fit to the stellar continuum is shown in red, and the residuals in green. The derived stellar kinematic parameters for each spectrum are also listed.