...
Model levels: 1/to/60, which are described at https://www.ecmwf.int/en/forecasts/documentation-and-support/60-model-levelsL60 model level definitions
Potential vorticity level:
...
...
Model levels: 1/to/60, which are described at https://www.ecmwf.int/en/forecasts/documentation-and-support/60-model-levelsL60 model level definitions
Potential vorticity level:
...