go  data/si
 fcc    10.26 1.0 1.0, , , ,
 0.001  1.5  sra  vwnasa nmag  init
  update   nbzq  100 0.02
 2
 Si  1  0  0.0  2   14   100
 Vc  1  0  0.0  2    0   100
 4 
   0.00000  0.00000  0.00000   Si
   0.25000  0.25000  0.25000   Si
   0.75000  0.75000  0.75000   Vc
   0.50000  0.50000  0.50000   Vc