View article

The CMB has distinct peaks in both its temperature angular power spectrum (TT) and temperature-polarization cross-power spectrum (TE). From the WMAP data we find the first peak in the temperature spectrum at ℓ= 220.1±0.8 with an amplitude of 74.7±0.5 μ K; the first trough at ℓ= 411.7±3.5 with an amplitude of 41.0±0.5 μ K; and the second peak at ℓ= 546±10 with an amplitude of 48.8±0.9 μ K. The TE spectrum has an antipeak at ℓ= 137±9 with a cross-power of-35±9 μ K 2, and a peak at ℓ= 329±19 with cross-power 105±18 μ K 2. All uncertainties are 1 σ and include calibration and beam errors.