#CoreShells bond  BondDipoles UreyBradley bend  inv  tors improper-torsion bond/bond bond/bend bend/bend stretch/torsion bend/torsion
          0    3            0           4    0    0     0                0         0         0         0               0            0
#bond stretch atom n1-n2, equilibrium distance, bondforce-constant
Si O  HARMONIC_BOND 251778.0783723000 1.605
Si Oa HARMONIC_BOND 251778.0783723000 1.605
Al Oa HARMONIC_BOND 251778.0783723000 1.76
#Urey-Bradly atom n1-n2, equilibrium distance, bondforce-constant
O  Si O   HARMONIC_UREYBRADLEY 51866.2841446938 2.61786
Oa Si O   HARMONIC_UREYBRADLEY 51866.2841446938 2.61786
Oa Si Oa  HARMONIC_UREYBRADLEY 51866.2841446938 2.61786
Oa Al Oa  HARMONIC_UREYBRADLEY 51866.2841446938 2.8707