| http://www.w3.org/ns/prov#value | - angle limit, said element being formed in the shape of a less than hemispherical portion of a spherical shell that is symmetric about a center of the sphere of which the shell is a portion, the extent of the shell providing an inner surface such that at each azimuthal and elevation scan angle limit, a projected aperture of the region of the reflector illuminated at that scan angle limit is not sh
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