Survey consistency null tests at 143 GHz and 217 GHz. Solid black points show difference of estimated separately on the two six-month surveys of the nominal mission. Magenta points show the auto-spectrum of obtained from maps made by taking the half-difference of the two surveys (S1−S2) × (S1−S2). Yellow points show the cross-spectrum of obtained on half-difference and half-sum maps (S1−S2) × (S1 + S2). The scatter on the tests that contain difference maps is very small because (as can be seen in Fig. 6) most of the lens reconstruction “noise” is due to primary CMB fluctuations, which is nulled in these tests.