Spectra extracted from all three analysed datacubes. All of these spectra have been normalised to 0.55 μm. One can clearly observe a gradual transition from the bluest spectrum (ROI2) to the reddest one (ROI8). The ID of the ROIs is the same as used for Figs. 4D–F and for Figs. 5 and 6. As in Figs. 5 and 6, the error bars presented include both the associated standard deviations and the OMEGA instrumental uncertainties.