MUSE ultraviolet spectra of the young star cluster (blue, bottom panel) with the X-shooter spectrum (green). The shaded gray regions show specific UV features that are closely associated with the VMS (N IVλ1486, He IIλ1640, and N IVλ1720), and some of them show a P Cygni profile, as is characteristic of young and massive stars. Furthermore, the black line shows the single BPASS model including only normal stars at 2.5 Myr, and the red line shows the BPASS single-star model augmented by VMS with masses up to 150 M_⊙. The upper panels show the zoom in VMS characteristic features compared with the models and the N Vλ1240 P Cygni line, which is characteristic of very young stellar populations.