Null-test results comparing power spectra from survey differences to those from the half-ring maps. Differences are: left: Survey 1 − Survey 2; middle: Survey 1 − Survey 3; and right: Survey 1 − Survey 4. These are for 30 GHz (top), 44 GHz (middle), and 70 GHz (bottom), for both TT and EE power spectra. There is a significant improvement in Survey 1 − Survey 2 and Survey 1 − Survey 4 at 30 GHz, especially in EE.
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