Fractional 143 GHz difference maps on the form (d143 - ds1−d143 - ds2) /d143 - ds1, as evaluated from the real data (top) and from the FFP8 simulation (bottom), both smoothed to 40′ FWHM. The 1% difference observed along the Galactic plane is caused by a mismatch between the measured bandpass profiles (which are used to construct the FFP8 simulations) and those corresponding to in-flight observations. See Sect. 4.3 for further discussion, and Sect. 5.3 for explicit corrections.
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