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<pre>
retrieve,
  class=mc,
  stream=oper,
  expver=1,
  date=-2,
  time=00:00:00,
  type=fc,
  step=0,
  levtype=sfc,
  <b><font color="red">param=208.210</font></b>,      <b><font color="red"># sea salt aerosol optical depth at 550nm</font></b>
  target="output_sea_salt_aerosol_550.grib1"
<pre>

<pre>
retrieve,
  class=mc,
  stream=oper,
  expver=1,
  date=-2,
  time=00:00:00,
  type=fc,
  step=0,
  levtype=ml,
  levelist=1/to/137sfc,
  <b><font color="red">param=457000</font></b>,      <b><font color="red"># Aerosol optical depth</font></b>
  <b><font color="red">chem=936</font></b>,          <b><font color="red"># Sea salt aerosol</font></b>
  <b><font color="red">wavelength=550</font></b>,    <b><font color="red"># At 550nm</font></b>
  target="output_sea_salt_aerosol_550.grib2"
<pre>