retrieve,
    area=39.5/140/39.5/140,
    class=od,
    date=20201101,
    expver=1,
    grid=0.1/0.1,
    number=1,
    padding=0,
    param=229.140/232.140/245.140,
    step=9,
    stream=waef,
    time=00/06/12/18,
    type=pf,
    target=reference.0GhkzD.data 
