 eigenvalues come first;
          = 'U':  Unstable eigenvalues come first.

  ACC     CHARACTER*1
          Specifies whether or not iterative refinement should be
          used to solve the system of algebraic equations giving
          the solution matrix X, as follows:
          = 'R':  Use iterative refinement;
          = 'N':  Do not use iterative refinement.

</PRE>
<B>Input/Output Parameters</B>
<PRE>
  N       (input) INTEGER
          The actual state dimension, i.e., the order of the
          