Differences between the SC, OE, and HM specific terms entering the 143 × 143 TT power spectrum (see text). The top right triangle shows the various power spectra differences in terms of statistical deviations, while the bottom left shows the spectral difference. Blue, purple, and grey are the null tests for HM, OE, and SC, respectively, obtained by computing the difference between the two terms specific to each case, while orange, red, and pink are HM-specific terms minus SC, OE specific terms minus SC, and HM minus OE, respectively. Error bars are obtained from a simple covariance-matrix approximation, using the empirical spectrum and the sky fractions, and ignoring the mask corrections.