@BeginModule
@Name      = Vertintap
@Title     = Vertical interpolation
@Section   = Interpolation
@Class     = Interpolation
@Arguments = ifile ofile
@Operators = ap2pl

@BeginDescription
Interpolate 3D variables on hybrid sigma height coordinates to pressure levels.
The input file must contain the 3D air pressure. The air pressure is identified
by the netCDF CF standard name air_pressure.
This operator requires all variables on the same horizontal grid.
@EndDescription
@EndModule


@BeginOperator_ap2pl
@Title     = Model to pressure level interpolation
@Parameter = plevels
@EndOperator


@BeginParameter
@Item = plevels
FLOAT  Pressure levels in pascal
@EndParameter


@BeginNote
This is a specific implementation for netCDF files from the ICON model, it may not work with data from other sources.
@EndNote


@BeginExample
To interpolate 3D variables on hybrid sigma height level to pressure levels of 925, 850, 500 and 200 hPa use:
@BeginVerbatim
   cdo ap2pl,92500,85000,50000,20000 ifile ofile
@EndVerbatim
@EndExample
