| http://www.w3.org/ns/prov#value | - It became evident from simulation that even when a reflector has a shape other than the ribbed one as described above and has a shape comprising a continuous curved surface as shown in FIG. 3, it is possible to achieve the window type characteristic, as long as the degree of the cross-sectional shape decreases from that of a quadratic surface to that of a curved surface with a power of 3/2 forming
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