# CMB power spectra

The main product to express cosmological constraints imposed by Planck data is a likelihood code. One of its by-products is the derived maximum-likelihood CMB spectrum, which is available for plotting purposes; see product section.

The likelihood code itself was released together with the corresponding "CMB power spectra and likelihood" paper (Planck-2015-A11^{[1]}). A short summary of the approach (similar to that used in 2013) is also available in the 2015 release parameters paper (Planck-2015-A13^{[2]}).

## References[edit]

- ↑
**Planck 2015 results. XI. CMB power spectra, likelihoods, and robustness of cosmological parameters**, Planck Collaboration, 2016, A&A, 594, A11. - ↑
**Planck 2015 results. XIII. Cosmological parameters**, Planck Collaboration, 2016, A&A, 594, A13.

Cosmic Microwave background