et of Chebyshev polynomials. 
 
   cdata          Array containing all the sets of Chebyshev 
                  polynomial coefficients to be placed in the 
                  segment of the SPK file.  The coefficients are 
                  stored in `cdata' in order as follows: 
 
                     the (degree + 1) coefficients for the first 
                     coordinate of the first logical record 
 
                     the coefficients for the second coordinate 
 
                     the coeffici