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Planck 2013 results
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Table 12

Best-fit amplitude parameter for the bispectrum prescription (Eq. (61)), and the values of χ2 and number of degrees of freedom associated with the fit.

Band α χ 2 N d.o.f.

217 GHz (1.90 ± 0.5) × 10-3 21.4 37
353 GHz (1.21 ± 0.07) × 10-3 45.5 39
545 GHz (1.56 ± 0.06) × 10-3 95.9 35