quantum-espresso/QHA/tetrahedra/ttrinp_ortho_simple

  8  6   8
  0.000000  0.000000  0.000000  ! \Gamma
  0.500000  0.000000  0.000000  ! X
  0.000000  YY        0.000000  ! Y
  0.500000  YY        0.000000  ! S
  0.000000  0.000000  ZZ        ! Z
  0.500000  0.000000  ZZ        ! U
  0.000000  YY        ZZ        ! T
  0.500000  YY        ZZ        ! R
  1  7  3  4
  1  7  4  8
  1  7  8  5
  1  2  3  5
  7  3  5  6
  3  5  6  2