 NAIF code for the center of motion of the body. 
   frame      I   Reference frame name. 
   first      I   Start time of interval covered by segment. 
   last       I   End time of interval covered by segment. 
   segid      I   Segment identifier. 
   intlen     I   Length of time covered by record. 
   n          I   Number of records in segment. 
   polydg     I   Chebyshev polynomial degree. 
   cdata      I   Array of Chebyshev coefficients. 
   btime      I   Begin time of first record. 
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