One-dimensional spectrum covering the Lyα line for ID 1-24 for the bright quasar sample presented in QSO MUSEUM I. The ID of each quasar is shown in the top left corner of each panel. Each panel shows a spectrum integrated from the MUSE data cube inside a 1.5” radius aperture centered at the quasar location (black line) and the integrated spectrum of each detected nebula integrated from the PSF- and continuum-subtracted data cubes within the 2σ isophotes from Figure C.1 (red line). The wavelength of the peak of the Lyα emission of each quasar is indicated with a blue vertical line. We mask the 1”×1” PSF normalization region when we extract a spectrum using the PSF- and continuum-subtracted data cubes. All the spectra are shown as normalized to their peak emission to allow comparison to Figure 2 of Arrigoni Battaia et al. (2019a).