SPK file will help optimize how the SPICE 
   system accesses the file. 
 </PRE>
<h4><a name="Examples">Examples</a></h4>
<PRE>
 
   Suppose that you have sets of Chebyshev polynomial coefficients 
   in an array `cdata' pertaining to the position of the moon (NAIF ID 
   = 301), relative to the Earth-moon barycenter (NAIF ID = 3), in 
   the J2000 reference frame, and want to put these into a type 3 
   segment in an existing SPK file. The following code could be used 
   to add one new type 3 segment.  To