:term:`DIIS_START_CONVERGENCE <DIIS_START_CONVERGENCE (DCFT)>`
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      Value of RMS of the density cumulant residual and SCF error vector below which DIIS extrapolation starts. Same keyword controls the DIIS extrapolation for the solution of the response equations.

      * **Type**: :ref:`conv double <op_c_conv>`
      * **Default**: 1e-3

