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retrieve,
  class   = ea,
  stream  = oper,
  expver  = 1,
  date    = 19931101/to/19931130,
  time    = 00/to/23,
  type    = an,
  levtype = sfc, 
  param   = 141.128,
  repres  = gg,
  target  = "era5.199311.sd"

#                                  It retrieves 30 x 24 = 720 fields.