:term:`CFOUR_TAMP_SUM <CFOUR_TAMP_SUM (CFOUR)>`
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      Specifies how often the largest :math:`t` amplitudes are to be printed. For =0, amplitudes are printed at the beginning and end of the run. For =1, amplitudes are printed every iteration. For =2, amplitudes are printed every other iteration, etc.

      * **Type**: integer
      * **Default**: 5