Foreground components at each frequency. The data points and error bars show our results. The dashed line is an estimated upper limit on the magnitude of the SZ contamination derived in Sect. 5.3.3. We show the absolute value of this contribution, which is negative at frequencies less than 217 GHz. The dot-dashed line is the extragalactic point source contribution, with an amplitude measured from our data, as derived in Sect. 5.3.2. Again we show the absolute value, with the signal being negative below ℓ ∼ 1200. The oscillating solid line corresponds to the calculated ISW contamination.