| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS [0017] Illustrative, non-limiting embodiments of aspects of the present invention will be described by way of example with reference to the accompanying drawings, in which: [0018]FIG. 1A is a schematic drawing of a first embodiment of an optical system illustrating aspects of the present invention; [0019]FIG. 1B is a schematic drawing of a second embodiment of an
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