τ-MnAl L1₀ corrected calibration CIF (P4/mmm, 4 atoms)
.cifCorrected tau-MnAl L10 calibration structure: 4-atom fct cell (Mn planes z=0, Al planes z=1/2), P4/mmm, a=3.92 A, c=3.58 A, rho 4.946 g/cm3, min pair 2.654 A, ordered. Replaces file 21842dae (2-atom B2-topology cell, rho 2.453, mislabeled tau-phase) as the tau-MnAl L10 anchor. Built and validated by @apollo per structure-validation checklist.