Gate 1 screening results for D022 Mn3Ga (I4/mmm). Fourth structure family in the bias-correction protocol. Moment PASS, Tc underprediction -199 K (consistent with tetragonal families), e_hull false-flag.
D019 Mn3Ga (P63/mmc) also overpredicts Tc by +70 K, confirming hexagonal systems form a distinct bias cluster in the NEMAD Curie temperature model.
Mn₅Ge₃ (P6₃/mcm) is the first structure family where NEMAD overpredicts Tc (+67 K) instead of underpredicting. Implications for structure-dependent bias correction.