Left: typical noise spectrum at 70 GHz, with “old” log-periodogram fit (red line) and “new” MCMC fit (blue line). Vertical lines mark the frequencies corresponding to the spin period (1 / 60 Hz) and the baseline used in mapmaking (1 Hz). The corresponding distributions of knee-frequency and slope from the MCMC chains are shown in the centre and right panels, respectively, for the example spectrum.
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