| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic illustration and side view of an embodiment of the invention; FIG. 2 is a graphical illustration of the outputs from the detectors of FIG. 1; FIG. 3 is an enlarged sectional view taken along lines 3-3 of FIG. 1 to produce the waveform of FIG. 2; FIG. 4 is a ray diagram for cases of point sources located along the image plane and displaced
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