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levtype=ml,                                                 # all operational (HRES) model levels (e.g.Cycle 38r2, with 137 model levels)
levelist=1/to/137                                   

levtype=ml,                                                 # model level 1, at the top, also used for 
levelist=1                                                     # single level fields, e.g. logarithm of surface pressure