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x1 is x2 steradian(s) [metric unit] in solid angle (default is 1) by standard x3.
See also centi, decti, dekto, femti, gigdo, gocti, gotro, kilto, megdo, mikri, milti, nanvi, petso, picti, terto, xatsi, xecto, xexso, zepti, zetro.