RETRIEVE,
    DATASET    = tigge,
    CLASS      = TI,
    TYPE       = FC,
    STREAM     = OPER,
    EXPVER     = prod,
    REPRES     = SH,
    LEVTYPE    = PL,
    LEVELIST   = 250/500/850,
    PARAM      = 156,
    DATE       = 20231224,
    TIME       = 0000/1200,
    STEP       = 0,
    ORIGIN     = RKSL,
    TARGET     = reference.data,
    RESOL      = AUTO,
    AREA       = 90/0/-90/359.75,
    GRID       = .25/.25,
    PADDING    = 0,
    PROCESS    = LOCAL 