Spatial arrangement of the spectra of pointing S after a 2 × 2 binning of the spaxels overlaid on the HST V-band image. The X-axis of all spectra ranges from 6650 Å to 6750 Å. The Y-axis scale is the same for all spectra and ranges from  − 1.53 × 10^-17 to 1.53 × 10^-16 erg s^-1 cm^-2 Å^-1. Each spectrum is univocally identified by two numbers indicating the row and column occupied in the two-dimensional array. The orientation of the array is such that North is up and East is left.