Planck 353 GHz angular power spectrum differences extrapolated to 150 GHz, determined from the spectra computed on the M₁₋₅ regions presented in Appendix D.2 and the spectrum computed on M_B2. difference values for the five regions are shown using colours from yellow (for M₁) to dark red (for M₅). As in Fig. 9, the blue boxes represent the statistical uncertainties from noise associated with the M_B2 spectrum. They are centred on zero because we compute spectrum differences here.