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#Specifies

   #Specifies the ECMWF classification given to the data
    class="ei",

   #Identifies the forecasting system used to generated the data when the same meteorological types are archived
    stream=oper,

   #Is the version of the data, 1 is OPERATIONAL
    expver=1,

   #Denotes type of level
    levtype=sfc,

   #Meteorological parameter
    param=165.128/41.128,

   #Determines the type of field to be retrieved:
    type=an,

##DATE AND TIME KEYWORDS

#Specifies

   #Specifies the forecast time step from forecast base time
    step=0,

   #Base time
    time=00,

   #Specifies the Analysis date, the Forecast base date or Observations date
    date=2013-09-01/to/2013-09-30,

##POST-PROCESSING KEYWORDS

   #Output grid mesh
    grid=0.75/0.75,

   #Area
    area=75/-15/30/42.5 

##DATA STORAGE KEYWORDS
,

   #specifies a Unix file into which data is to be written after retrieval
    target="ei_sfc_165_41.grib",

##OPTIONAL MARS SERVICE KEYWORD
   #(Optional) argument to retrieve NetCDF format
     format="netcdf",