quantum-espresso/QHA/Phonon_DOS/ttrinp

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4 1 16
0.000000 0.000000 0.000000
0.500000 0.500000 0.500000
0.500000 0.500000 0.000000
1.000000 0.000000 0.000000
1 2 3 4
4 - total number of tetrahedra vertexes
1 - number of tetrahera comprising the IBZ
16 - each tetrahedra edge is divided by 16
Next lines are vertex coordinates in cartesian
Next 4 integer numbers are for tetrahedra vertex order (i.e. how they are connected,
in this particular case from point 1 to 4 thoroghout 2 and 3)