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RETRIEVE,
  STREAM  = EFOV,
  CLASS   = OD,
  DATE    = -1,
  TIME    = 00/12,
  EXPVER  = 1,
  STEP    = 240,
  TYPE    = PF,
  NUMBER  = 1/TO/50
  LEVTYPE = SFC,
  PARAM   = TPVAR,
  TARGET  = TP_EFOV

See also FAQ: "How can I compute the accumulation using data from the overlap stream?"

Post-processing

Retrieve the 1000,500 and 300 hPa temperatures for today at noon from the 12 UTC forecast of two days ago on an N48 Gaussian Grid  > see in MARS Catalogue

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retrieve,
  class   = e4,
  stream  = oper,
  expver  = 1,
  date    = 19931101/to/19931130,
  time    = 00/06/12/18,
  type    = an,
  levtype = sfc, 
  param   = sd,
  repres  = gg,
  target  = "era40.199311.sd"
#                                  It retrieves 30 x 4 = 120 fields.

  

See also these Web API retrieve examples for ERA-Interim, S2S, TIGGE, ERA-20C etc.