Masks used in the Plik likelihood in temperature (top) and polarization (bottom). Left to right: masks for 100 GHz (T66 top, P70 bottom), 143 GHz (T57 top, P50 bottom), and 217 GHz (T47 top, P41 bottom). Blue correspond to the Galactic (dust) mask, green is CO, and orange is the point-source and extended-source mask.
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