Comparison between the EWs of the blue and red bump features. Left panel: EW of the blue bump (specifically, the 4605−4650 Å complex) versus the EW of the red bump complex (measured between 5780−5850 Å). Right panel: EW[4605−4650 Å] versus EW(He IIλ4686). The circle points report similar measurements for a sample of local galaxies where the presence of VMS (purple) of WR stars (blue) has been identified (or suggested). Gray points mark systems with no signatures of WR or VMS, or galaxies with He IIλ4686 detection but no robust classification. Blue tracks are BPASS models for single bursts of star-formation of different ages (from 1 to 10 Myr), whereas dashed and dot-dashed red tracks are models including VMS contribution for single bursts and constant star-formation, respectively. Data and VMS models compiled from Martins et al. (2023) (see also references therein).