Top panel: spectrum of TucII-309 (black line) around the Mn λ4030.7 absorption feature, with synthetic spectra at [Mn/Fe] = −1.5, −1.0, and −0.5 overlaid along with a reference MIKE spectrum of the metal-poor halo star 2MASS J00011195+0321051 (purple) from Ezzeddine et al. (2020). 2MASS J00011195+0321051 has similar stellar parameters (T _eff = 4909 K, ﹩\mathrm{log}\,g﹩ = 1.75, v _micro = 1.85, [Fe/H] = −1.99; Ezzeddine et al. 2020) to TucII-309 but a [Mn/Fe] = −0.36, in line with the halo trend (see Figure 4). Bottom panel: same as the top panel, but around the Mn λ4754 absorption feature. The 2MASS J00011195+0321051 Mn λ4754 absorption feature is clearly visible, but the feature is not detected in TucII-309, demonstrating the low Mn abundance of TucII-309. Note that the Mn abundance from the λ4754 feature in Ezzeddine et al. (2020) for 2MASS J00011195+0321051 is [Mg/H] = −2.51, consistent with the above synthesis.