Si0.5Ge0.5 zincblende primitive cell
 1.0000000000000000
     0.0000000000000000    2.7531900000000000    2.7531900000000000
     2.7531900000000000    0.0000000000000000    2.7531900000000000
     2.7531900000000000    2.7531900000000000    0.0000000000000000
  Si  Ge
   1   1
Direct
  0.0000000000000000  0.0000000000000000  0.0000000000000000
  0.2500000000000000  0.2500000000000000  0.2500000000000000
