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The following MARS request will retrieve ERA-Interim (T255) vorticity, divergence and geopotential fields together with a gridpoint field that can be used to create the initial ICMSH and ICMGG files in a similar way to the above method.

retrieve,
  class=ei,
  type=an,
  stream=oper,
  date=20100212,
  time=12,
  step=0,
  expver=1,
  param=VOR/D/Z,
  levelist=1,
  levtype=ml,
  target="sh_ml"

 retrieve,
  class=ei,
  type=an,
  stream=oper,
  date=20091227,
  time=12,
  step=0,
  expver=1,
  param=139,
  levelist=off,
  levtype=sfc,
  target="sfc_gg"

and then set the appropriate ICMSH and ICMGG file names and experiment number as shown in the previous example.