ompute `ptarg' are expressed relative to a non-inertial frame in 
   the SPK files providing those data, additional kernels may be 
   needed to enable the reference frame transformations required to 
   compute the position.  These additional kernels may be C-kernels, PCK 
   files or frame kernels.  Any such kernels must already be loaded 
   at the time this routine is called. 
</PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
 
   This routine is part of the user interface to the SPICE ephemer