POSCAR for generated by WannierTools
1.0
    3.000000    0.000000    0.000000
    0.000000    3.000000    0.000000
    0.000000    0.000000    9.000000
X     
     3
Direct
    0.000000    0.000000    0.000000        X
    0.000000    0.000000    0.333333        X
    0.000000    0.000000    0.666667        X
