I noticed that the ECMWF freezing altitude layer seems to be height (above ground level) instead of altitude contrary of what is written in the details and layer name. The ICON model seems correct.
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RE: Freezing Altitude Layer: height vs altitude
Thanks for the link to the other thread. Regarding ICON: at least when I look at the current freezing "altitude" there are no significantly different levels e.g. above the alps which are clearly visible with ECMWF that lead to my conclusion that ICON is indeed reporting altitude.