:term:`CFOUR_VTRAN <CFOUR_VTRAN (CFOUR)>`
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      This keyword defines what type of integral transformation is to be performed in the program ``xvtran``. FULL/PARTIAL (=0) allows the transformation program to choose the appropriate type of transformation, while FULL (=1) requires a full integral transformation and PARTIAL (=2) means a MBPT(2)-specific transformation where the :math:`(ab \vert cd)` integrals are not formed.

      * **Type**: string
      * **Possible Values**: FULL/PARTIAL, FULL, PARTIAL
      * **Default**: FULL/PARTIAL