is less than 0 or greater than
       MAXDEG, the error will be diagnosed by a routine in the call
       tree of this routine.
 
   6)  If the last non-blank character of `segid' occurs past index 40,
       or if `segid' contains any nonprintable characters, the error will
       be diagnosed by a routine in the call tree of this routine.
 
   7)  The error SPICE(EMPTYSTRING) is signaled if either input string
       does not contain at least one character, since the input strings
       cannot be convert