| http://www.w3.org/ns/prov#value | - where R1 is a distance between the first light source 406 and the region 404 of the object 402, L is a distance between the first light source 406 and second light source 408, W1 and W2 are the intensity of lights reflected by the region 404 of object 402, respectively, and I1 and I2 are the intensity of lights irradiating from the first light source 406 and second light source 408, respectively.
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