$coord
    9.14078217974148      5.27843816416091      3.73096278638735  si
    5.47400522507287      3.16080504359818      2.23448123868065  si
$user-defined bonds
$redundant
     number_of_atoms             2
     degrees_of_freedom          1
     internal_coordinates        1
     frozen_coordinates          0
   1 k  1.0000000000000 stre    1    2           val=   4.47493
         1 non zero eigenvalues  of BmBt
           1           2.000000000    1    0
         1
$end
