...
The Potential Temperature editor belongs to a type of editor editors known as family editor editors which allows related sets of input specifications to be grouped in the same icon editor. The main computation type can be set via the Application parameter which offers these options:
...
Specifies the lnsp field as a GRIB icon. Only available/required for the ModelLevels sub-panewhen Level Type is set to Model Levels.
Temperature
Specifies the temperature field as a GRIB icon in on either model or pressure levels.
...
Specifies the specific humidity field as a GRIB icon in on either model or pressure levels. Only available/required for the when Application is set to Equivalent Potential Temperature pane.