Ac2 Mg1 Sn1 
   1.0
     0.0000000000000000    4.0932810000000002    4.0932810000000002
     4.0932810000000002    0.0000000000000000    4.0932810000000002
     4.0932810000000002    4.0932810000000002    0.0000000000000000
   Ac Mg Sn 
   2 1 1 
Direct
  0.250000000000 0.250000000000 0.250000000000 
  0.750000000000 0.750000000000 0.750000000000 
  0.000000000000 0.000000000000 0.000000000000 
  0.500000000000 0.500000000000 0.500000000000 
