:term:`INTERFRAGMENT_CONNECT <INTERFRAGMENT_CONNECT (OPTKING)>`
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      When connecting disparate fragments when frag_mode = SIMPLE, a "bond" is assigned if interatomic distance is less than (this number) * sum of covalent radii. The value is then increased until all the fragments are connected (directly or indirectly).

      * **Type**: double
      * **Default**: 1.8