Relative gain, from the square root of the SPIRE-to-HFI power spectrum ratio, for each field at 545 GHz (left) and 857 GHz (right). The mean gain GPSD from the power spectrum analysis (solid line) is in close agreement with the mean gain GScat from pixel-to-pixel analysis (dotted line), which is well within the 1σ dispersion of the latter (shaded in grey).
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