WMAP DR1 Combined TT Power Spectrum Description
The data made available through this page has been updated. The most recent version of this data may be accessed through https://lambda.gsfc.nasa.gov/product/wmap/current/
The best-estimate WMAP temperature power spectrum of the CMB is produced from a weighted combination of the 28 cross power spectra. For multipole moment l < 100, the combined spectrum is formed from a simple weighted average of the 15 V and W band cross-power spectra. For l > 100, all 28 cross power spectra are used to form the combined spectrum, but different weighting schemes are used for three separate l regimes.
The complete (unbinned) TT power spectrum data are provided as an ASCII table containing the following columns:
The diagonal elements provide an estimate of the error, but should not be used as exact error bars. The complete Fisher matrix should be used for that purpose.
A binned version of the power spectrum is also available, in a separate file whose format and content are similar to those described above for the unbinned data. The choice of l bins is the same as that used in e.g., Figure 8 of Hinshaw et al. (see below).
More details can be found in: