4750-7100Å integrated spectrum of the inner 5 kpc. The observed spectrum is reported in black, while the best-fit stellar continuum and the emission lines from the ionised gas are shown in blue and green, respectively. The model, i.e. the sum of the blue and green curves, is plotted in red. We shifted the emission lines flux up by 50 × 10⁻¹⁵ erg s⁻¹ cm⁻² for visualisation purposes. The bottom panel contains the residuals in terms of data−model. The observed 5775-6010Å range was originally masked because it is affected by the adaptive optics laser. The flux in these channels is set to the median value of the spectrum prior the fit. The high residual spikes around 6300Å are not real emission lines, but faulty channels.