:term:`HESS_UPDATE <HESS_UPDATE (OPTKING)>` """"""""""""""""""""""""""""""""""""""""""" Hessian update scheme * **Type**: string * **Possible Values**: NONE, BFGS, MS, POWELL, BOFILL * **Default**: BFGS
:term:`HESS_UPDATE <HESS_UPDATE (OPTKING)>` """"""""""""""""""""""""""""""""""""""""""" Hessian update scheme * **Type**: string * **Possible Values**: NONE, BFGS, MS, POWELL, BOFILL * **Default**: BFGS