M�e�a�s�u�r�e�m�e�n�t� �o�f� �q�u�a�r�t�z� �c�r�y�s�t�a�l� �u�n�i�t� �p�a�r�a�m�e�t�e�r�s� �B�a�s�i�c� �m�e�t�h�o�d� �f�o�r� �t�h�e� �m�e�a�s�u�r�e�m�e�n�t� �o�f� �r�e�s�o�n�a�n�c�e� �f�r�e�q�u�e�n�c�y� �a�n�d� �r�e�s�o�n�a�n�c�e� �r�e�s�i�s�t�a�n�c�e� �o�f� �q�u�a�r�t�z� �c�r�y�s�t�a�l� �u�n�i�t�s� �b�y� �z�e�r�o� �p�h�a�s�e� �t�e�c�h�n�i�q�u�e� �i�n� �a� �� -�n�e�t�w�o�r�k: