e square-root version of the
  stochastic Balance & Truncate method [1] is used to reduce
  the ALPHA-stable part G1.

  If JOB = 'S', the stochastic balancing method is used to reduce
  the ALPHA-stable part G1, in conjunction with the square-root
  version of the Singular Perturbation Approximation method [3,4].

  If JOB = 'P', the stochastic balancing method is used to reduce
  the ALPHA-stable part G1, in conjunction with the balancing-free
  square-root version of the Singular Perturbation Approximati