## [Planck Likelihood 2015] Nuisance parameters width set to 0

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
Luke Hart
Posts: 40
Joined: July 13 2015
Affiliation: University of Manchester

### [Planck Likelihood 2015] Nuisance parameters width set to 0

Dear all,

I've been grappling with some of the values in the Planck likelihood release for plik_...._TTTEEE.xxx and as you can see, there are lots of nuisance parameters which have start and proposal widths set to 0. These go with what the Planck priors are saying in Planck likelihood here.

What effects are actually considered from things like beams and the indices parameters when all their widths are set to 0?

Thanks
Luke

Antony Lewis
Posts: 1384
Joined: September 23 2004
Affiliation: University of Sussex
Contact:

### Re: [Planck Likelihood 2015] Nuisance parameters width set t

They are just fixed, in many cases to zero.