Amplitudes of EE and BB power spectra for dust and synchrotron emission at 353 and 30 GHz, respectively, shown for each sky region and each multipole bin. The A_s and A_d parameters of our spectral model from Eq. (2) are thermodynamic (CMB) temperature in μK². Where the synchrotron amplitude is compatible with zero at the 1 σ level, we report an upper limit on A_s (68% confidence limit) with triangles pointing down.