-stable/unstable diagonal
                blocks failed because of very close eigenvalues;
          = 9:  the resulting order of reduced stable part is less
                than the number of unstable zeros of the stable
                part.
</PRE>
<A name="Method"><B><FONT SIZE="+1">Method</FONT></B></A>
<PRE>
  Let be the following linear system

       d[x(t)] = Ax(t) + Bu(t)
       y(t)    = Cx(t) + Du(t),                      (1)

  where d[x(t)] is dx(t)/dt for a continuous-time system and x(t+1)
  