FN Object: (f1_) 1 MPI process
  type: exp
    exponential: exp(-2.5*x)
    computing matrix functions with: scaling & squaring, [m/m] Pade approximant (Higham)
FN Object: (f2_) 1 MPI process
  type: rational
    rational function: (-1*x^1+1) / (+1*x^2-6*x^1+4)
