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first radiation constant for spectral radiance  Value  1.191 042 953 x 10-16 W m2 sr-1  Standard uncertainty  0.000 000 015 x 10-16 W m2 sr-1   Relative standard uncertainty   1.2 x 10-8  Concise form  1.191 042 953(15) x 10-16 W m2 sr-1       Click here for correlation coefficient of this constant with other constants Source: 2014 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant