:term:`FIXED_COORD_FORCE_CONSTANT <FIXED_COORD_FORCE_CONSTANT (OPTKING)>`
"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

      In constrained optimizations, for coordinates with user-specified equilibrium values, this is the initial force constant (in au) used to apply an additional force to each coordinate.

      * **Type**: double
      * **Default**: 0.5