This is the page regarding the HFI-based power spectra
We call intra-frequency checks those performed between detectors (or sets of) in the same frequency bands, which thus respond similarly to the sky emission. Interfrequency-checks on the other hand correspond to checks bewteen detector in different frequency bands, imposing further reliance on a sky model to perform the test.
Best-fit frequency spectra
(Planck) High Frequency Instrument