Angular power spectra for the scale-invariant (i.e., nℛℛ = 1) pure adiabatic mode (ADI, green dashed curves) and for the scale invariant (nℐℐ = 1) pure isocurvature (CDI, NDI, or NVI) modes, with equal primordial perturbation amplitudes. The thick lines represent the temperature auto-correlation (TT) and the thin lines the E-mode polarization auto-correlation (EE).
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