:term:`INTS_TOLERANCE <INTS_TOLERANCE (SAPT)>`
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      Minimum absolute value below which all three-index DF integrals and those contributing to four-index integrals are neglected. The default is conservative, but there isn't much to be gained from loosening it, especially for higher-order SAPT.

      * **Type**: :ref:`conv double <op_c_conv>`
      * **Default**: 1.0e-12