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2
Steradian.svg
Steradian.svg
http://commons.wikimedia.org/wiki/Special:FilePath/Steradian.svg
solid angle
P18
Q208476-7f58b2a2-4172-0f50-607e-4fb8f0a523ac
P18
Steradian.svg
http://commons.wikimedia.org/wiki/Special:FilePath/Steradian.svg