.,NBLCKS, is the number
  of elementary Kronecker blocks of size k x (k+1).

  If MODE = 'B' or 'T' on entry, then the difference nu(k)-mu(k+1),
  for k = 1,2,...,NBLCKS, is the number of infinite elementary
  divisors of degree k (with mu(NBLCKS+1) = 0).

  If MODE = 'S' on entry, then the difference mu0(k)-mu0(k+1),
  for k = 1,2,...,NBLCKI, is the number of infinite elementary
  divisors of degree k (with mu0(NBLCKI+1) = 0).
  In the pencil sE(r)-A(r), the pencils sE(f)-A(f) and
  sE(eta)-A(eta) can be s