Planck 2015 results
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Table 9

Slope found in the plots of predicted versus measured flux densities in five of the Planck bands.

Channel Slope Required Δα

44 ........... 0.985 ± 0.005 + 0.066
70 ........... 1.025 ± 0.005 −0.125
100 ........... 1.038 ± 0.005 −0.210
143 ........... 0.997 ± 0.005 + 0.015
217 ........... 1.017 ± 0.005 −0.076

Notes. A slope > 1 implies that the measured flux density exceeds the predicted value. Departures from unit slope can be explained by slight curvature of the spectra; we show the required change in spectral index, Δα, to explain the departure from unity.

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