Γ:  [-2.6660253  -1.83354045]
X:  [-2.65423566 -1.96377666]
E_F (HOMO): -2.654236 Ha
DOS integrated: 2.0000 (should be ≈ 2)
Wrote /Users/mpei/mpei-documents/vibeqc/.claude/worktrees/clever-wilbur-1d0231/examples/output-h-chain-bands.png