Key points are not available for this paper at this time.
Acknowledgements. The Planck Collaboration acknowledges the support of: ESA; CNES, and CNRS/INSU-IN2P3-INP (France) ; ASI, CNR, and INAF (Italy) ; NASA and DoE (USA) ; STFC and UKSA (UK) ; CSIC, MINECO, JA and RES (Spain) ; Tekes, AoF, and CSC (Finland) ; DLR and MPG (Germany) ; CSA (Canada) ; DTU Space (Denmark) ; SER/SSO (Switzerland) ; RCN (Norway) ; SFI (Ireland) ; FCT/MCTES (Portugal) ; ERC and PRACE (EU). A description of the Planck Collaboration and a list of its members, indicating which technical or scientific activities they have been involved in, can be found at http: //www. cosmos. esa. int/web/planck/planck-collaboration.
P.A.R et al. (2016) studied this question.