Planck 2015 results
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Fig. 1

image

Comparison of transfer functions for the scalar and tensor modes. The CMB transfer functions and , where , define the linear transformations mapping the primordial scalar and tensor cosmological perturbations to the CMB anisotropies as seen by us on the sky today. These functions are plotted for two representative values of the multipole number: = 2 (in black) and = 65 (in red).

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