:term:`CFOUR_CPHF_CONVER <CFOUR_CPHF_CONVER (CFOUR)>`
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      Specifies the convergence criterion for the iterative solution of the CPHF and Z-vector equations. The solutions are considered to be converged when the residual norm of the error vector falls below :math:`10^N`.

      * **Type**: integer
      * **Default**: 12