An oscilloscope includes a number of probe assemblies. An aperture is formed in the diaphragm member, and the aperture has a shape such that the f-numbers at a plurality of directions from the at least one optical system are different f-numbers, according to contrast properties of each direction of the liquid crystal display device. A Search Logic Unit can compute a relevance of any particular leaf category to the base query. The first end plate and the second end plate include a keel extending therefrom, whereby the keel traverses longitudinally between a first lateral side and a second opposed lateral side and is substantially perpendicular to the sagittal plane of the patient’s spine. Upon a cache miss for a data item, a cache snoop and access to physical memory are initiated in parallel for the data item if the indicator bit is a first predetermined bit or zero ) whereas a cache snoop is initiated if the most significant bit is a second predetermined bit or one ).