Top: H3 spectra for seven members in Specter, with the best-fitting MINESweeper model overlaid in red. The topmost star is the BHB, for which a reliable metallicity cannot be estimated. A masked telluric region is shown in gray, and we indicate strong Fe I lines in blue. Bottom: comparison between H3 spectra for the most metal-poor member in Specter, and a reference star at higher metallicity selected from the H3 catalog to have similar temperature, surface gravity, and spectral signal-to-noise ratio. Both spectra are smoothed with a 5 pixel boxcar. Note in particular the Fe line at ≈5170 Å that is much weaker in the Specter member than the reference star. We emphasize that the full-spectrum-fitting MINESweeper routine picks up on aggregate spectral details that are difficult to discern by eye. Regardless, this comparison reassures us about this member’s metallicity.