!    ibrav = 0, nat = 2, ntyp = 1
CELL_PARAMETERS bohr
    0.0000000000000000    5.1306064620899088    5.1306064620899088
    5.1306064620899088    0.0000000000000000    5.1306064620899088
    5.1306064620899088    5.1306064620899088    0.0000000000000000
ATOMIC_SPECIES
 Si   28.08550   Si.upf
ATOMIC_POSITIONS crystal
 Si   0.0000000000000000  0.0000000000000000  0.0000000000000000
 Si   0.2500000000000000  0.2500000000000000  0.2500000000000000