Planck 2018 results
Open Access

Fig. 39.


One-dimensional posterior distributions for cosmological and nuisance parameters using the TT high- likelihood with a τ-prior of 0.055 ± 0.09 (we used the PICO code for this test, Fendt & Wandelt 2006). We show the results using the dust templates and priors from the 2018 release (black solid line), 2018 templates with the 2015 priors (black dashed), and the 2015 dust templates with the 2015 priors (red solid), assuming a ΛCDM model. The dot-dashed grey lines show the Gaussian priors applied in 2018, while the dotted grey lines show the ones applied in 2015. We only show the most significantly affected parameters, with ns being the cosmological parameter most altered, at the level of about 0.1 σ. On the other hand, the change in the shape of the template has a large impact on foreground parameters. This is due to the fact that the 2015 templates had a more pronounced bump at  ≈ 300, but similar high- slopes and similar amplitude priors at  ≈ 200, which induced a correlated shift in the point-source and CIB amplitudes at 217 GHz.

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