:term:`E_CONVERGENCE <E_CONVERGENCE (MRCC)>`
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      Convergence criterion for energy. See Table :ref:`Post-SCF Convergence <table:conv_corl>` for default convergence criteria for different calculation types. This becomes ``tol`` (option \#16) in fort.56.

      * **Type**: :ref:`conv double <op_c_conv>`
      * **Default**: 1e-6