:term:`PROPERTY <PROPERTY (CCRESPONSE)>`
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      Array that specifies the desired frequencies of the incident// radiation field in CCLR calculations. If only one element is// given, the units will be assumed to be atomic units. If more// than one element is given, then the units must be specified as the final// element of the array. Acceptable units are HZ, NM, EV, and AU.

      * **Type**: string
      * **Possible Values**: POLARIZABILITY, ROTATION, ROA, ALL
      * **Default**: POLARIZABILITY

