Spectra (black lines) and template fits (green lines) to the CO 2–0 and CO 3–1 stellar absorption features. These are for individual bins in the southern nucleus (top), the northern nucleus (middle) and in the region of high dispersion between them (bottom). The blue line indicates the continuum (i.e. zero) level; red asterisks denote pixels rejected during the fit; the pairs of magenta lines enclose regions around the bandheads for which the weighting is enhanced during the fit. These plots demonstrate the quality of the fit using our single M3 III template.