Fig. 1

The result of the χ2 method for the case where the sources follow a β(T) relation with parameters A = 2.2 and B = −0.3 and the measurements in Herschel bands have a relative noise of 5%. The left-hand frame shows the estimated T and β values and the fitted β(T) relation. The right-hand frame shows the absolute errors in the T and β values of the sources.
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