of
          order 2N. If ACC = 'R', and INFO = 0 or INFO = 7, DWORK(3)
          returns the reciprocal pivot growth factor (see SLICOT
          Library routine MB02PD) for the LU factorization of the
          coefficient matrix of the system of algebraic equations
          giving the solution matrix X; if DWORK(3) is much
          less than 1, then the computed X and RCONDU could be
          unreliable. If INFO = 0 or INFO = 7, DWORK(4) returns the
          scaling factor used to scale Q, R, and L. 