:term:`CACHELEVEL <CACHELEVEL (OCC)>`
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      Cacheing level for libdpd governing the storage of amplitudes, integrals, and intermediates in the CC procedure. A value of 0 retains no quantities in cache, while a level of 6 attempts to store all quantities in cache. For particularly large calculations, a value of 0 may help with certain types of memory problems. The default is 2, which means that all four-index quantites with up to two virtual-orbital indices (e.g., :math:`\langle ij | ab \rangle>` integrals) may be held in the cache.

      * **Type**: integer
      * **Default**: 2