:term:`NAT_ORBS_WRITE_ROOT <NAT_ORBS_WRITE_ROOT (DETCI)>`
"""""""""""""""""""""""""""""""""""""""""""""""""""""""""

      Sets the root number for which CI natural orbitals are written to PSIF_CHKPT. The default value is 1 (lowest root).

      * **Type**: integer
      * **Default**: 1