Unbinned S/N per frequency for TT (solid blue, for those detector combinations used in the estimate of the TT spectrum), EE (solid red), and TE (solid green). The horizontal orange line corresponds to S/N = 1. The dashed lines indicate the S/N in a cosmic-variance-limited case, obtained by forcing the instrumental noise terms to zero when calculating the power spectrum covariance matrix. The dotted lines indicate the cosmic-variance-limited case computed with the approximate formula of Eq. (20).