A fingerprint authenticating system includes a fingerprint registering unit and a fingerprint collating unit. Fast fourier transform digital filters are used to provide a frequency spectrum of the sum and difference I. Each attachment is slidably and adjustably mounted to the head. Before scheduling an operator in the query plan, it is determined when an eviction is to be performed based a level of free memory of the processing system. After accessing, the volumetric model is analyzed to identify a plurality of sets of adjacent primitives within the model for processing. The sidewalls are joined together at first and second ends, and are spaced apart by a strut extending transversely between them to define first and second hook openings.