Planck 2015 results
Free Access

Fig. 25

image

Example of measured summed, (a + b), time stream noise power spectral densities (PSDs; dashed lines) and the difference in the PSD between (a + b) and (ab) (solid lines). These spectra are bin-by-bin median values across the entire mission and were derived by first measuring the sample autocovariance as described in Planck Collaboration XII (2016).

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