IMUK0   (output) INTEGER array, dimension (limuk0),
          where limuk0 = N if MODE = 'S' and 1, otherwise.
          If MODE = 'S', then the leading NBLCKI elements of this
          array contain the dimensions mu0(1),...,mu0(NBLCKI)
          of the square diagonal submatrices in the pencil
          sE(inf)-A(inf).
          Otherwise, IMUK0 is not referenced and can be supplied
          as a dummy array.

  MNEI    (output) INTEGER array, dimension (3)
          If MODE = 'B' or 'T' then
          