Comparison of HST/STIS UV spectra of MWC 656 (top) with those of two candidate Be+subdwarf binaries, HD 55606 and HD 157832 (Wang et al. 2021). Different colours represent different observational epochs. All spectra are normalised by their median flux, and vertical offsets have been applied for clarity. Narrow lines near 1240 Å originate from ISM absorption. Like MWC 656, both comparison systems exhibit line profile variability in N V and possible signatures of stellar winds.