tained in a file). </p>
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<a name="DESCRIPTION"></a>
<!-- BEGIN DESCRIPTION -->
<div>   Perform I/O and time interpolation for external fields.
   Uses udunits library to calculate calendar dates and
   convert units.  Allows for reading data decomposed across
   model horizontal grid using optional domain2d argument
   <br>
<br>
   data are defined over data domain for domain2d data
   (halo values are NOT updated by this module)
   <br>
<br> 
</div>
<br>
<!-- END DESCRIPTION -->
<a nam