Observed integrated spectrum of NGC 3603 within the whole MUSE FoV (top; solid black line), plotted alongside a montage of spectra from several individual stars in the field (solid grey lines). The individual stars are identified with their respective identification numbers (see Fig. 2). The integrated spectrum is the sum of all the spaxels in the FoV and thus includes all the individual stellar spectra and the associated nebulosity. The strongest emission lines in the integrated spectrum are indicated. Spectra are wavelength and flux calibrated.