Left – LFI backend temperatures (black – left BEM1 sensor; blue – left BEM2 sensor; red – right BEM1 sensor; green – right BEM2 sensor) around day 259 of flight operations, when the transition to an always-on condition for the transponder was implemented. Right – comparison of the Fourier transform amplitude of the Left BEM1 sensor before (black) and after (blue) transition to stable, showing the daily time scale peaks disappearing.