Planck 2013 results
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Fig. 8

image

Estimate of the uncertainties of Tobs (left) and βobs (right) due to noise and the CIBA for a two-step fit to single dust SEDs with Tobs = 20.8 K and βobs = 1.55 but increasing τ353. These results were obtained using Monte Carlo simulations (see Appendix C). The fits for βobs were carried out assuming noise and CIBA levels at 30 and a free Tobs. The fits for Tobs were carried out assuming noise and CIBA levels at 5 and a fixed βobs = 1.55. The dots give the contribution of the noise (blue) and the CIBA (orange) to the uncertainties, and the quadratic sum of the two (black). The top axes of both plots indicate the fraction of sky that has τ353 lower than the value on the lower axis.

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