 A and E, and EPS
          is the machine precision (see LAPACK Library routine
          DLAMCH). TOL(2) = 0 is not always a good choice.
          TOL(2) &lt; 1. TOL(2) is not used if EQUIL = 'N'.
          TOL(3) is the tolerance to be used in rank determinations
          when transforming (lambda*E-A,B,C), if CKPROP = 'C'. If
          the user sets TOL(3) &gt; 0, then the given value of TOL(3)
          is used as a lower bound for reciprocal condition numbers
          in rank determinations; a (sub