Example of TOD parameters Gibbs chain for the 30 GHz LFI 27M radiometer. From top to bottom, the panels show normalized reduced χ² for a single Pointing Period; gain for the same PID in units of mV K⁻¹; bandpass correction in MHz; white noise level, σ₀; correlated noise slope, α; and correlated noise knee frequency, f_knee. The four different colored curves correspond to independent Gibbs chains.