pickup.

-   Azimuthal Range: We difference the data depending on the observation azimuth to maximize sensitivity to emission from the ground and structures around the telescope. We group the data according to the magnitude of observed ground emission on several degree scales, as detailed by S11.

-   Time: We difference the data based on observation time. We compare data from the first half of the observations of a field to the second half. This tests the temporal stability of the instrument, including calibration, pointing, detector responsivity and linearity, and any other long time-scale effect.

We find the results of each test to be consistent with zero. The results are plotted in Figure \[fig:jackknife\].

Combining all three frequencies, the probabilities to exceed (PTE) for the “scan direction", “azimuthal range", and “time" null tests are 0.02, 0.79, and 0.96 respectively. At 95, 150, and 220 GHz, the combined PTEs for the three tests combined are 0.43, 0.37, and 0.68. Table \[tab:PTE\] shows the PTEs for the nine individual null tests. We conclude that there is no evidence for systematic biases.

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& 95 GHz & 150 GHz & 220 GHz & Combined\
Scan dir. &0.34 