Flux normalised Hα velocity profiles for the subsample of observed sources (similar to Fig. 5). We compare the Gaia low-resolution BP/RP spectrum (red solid line) with our new follow-up spectrum, degraded to match the BP/RP resolution (blue dashed line). The original-resolution follow-up spectrum is plotted in grey for comparison. All sources are shown on the same scale. The index corresponding to each source (see Table B.2) is shown in the bottom left corner of each spectrum.