| http://www.w3.org/ns/prov#value | - e Rn-1 is the length of the preceding radius vector and K is a constant,and their angle T of orientation determined in accordance with the relationship: T=Cos-1 (Rn 2 +Rn+1 2 -L2)/(2Rn Rn+1) where L is the distance between the ends of the radius vectors. 2.
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