High-level comparison of measurements from eight temperature sensors that are particularly relevant for LFI. Sensors TS5L, TS6L, TS1R, and TS2R are installed in the 20 K focal plane frame, while LVHX1 is the liquid-vapor heat exchanger providing 18 K to HFI; sensors L1_4K, L2_4K, and Cernox_4K are on the HFI 4 K stage supporting the LFI 4 K reference loads. The step-like increases in the 20 K stage are visible both before and after the sorption cooler switchover event (near PID 11 000). For details on the locations of the various temperature sensors, see Fig. 21 of Bersanelli et al. (2010) and Fig. 18 of Lamarre et al. (2010). For visualization purposes, the mean value has been subtracted from each data set, and some have been scaled by one or two orders of magnitude, as indicated in the legend.