  CALICE collaboration is developing highly granular calorimeters suitable for
individual reconstruction of particles in the jets using Particle Flow
Algorithms. Such calorimeters should provide the best jet energy resolution at
future high energy $e^{+}e^{-}$ colliders. At high jet energies, typically
above 70-100 GeV, the jet particle showers start to overlap, and the resolution
is determined by the ability to separate them. Here, we present the results on
the separation of two overlapping electromagnetic or electromagnetic - hadronic
showers obtained by mixing of the single shower events collected with CALICE
SiW ECAL and AHCAL physics prototypes during beam tests at CERN'07 and
FermiLab'11, and using International Large Detector (ILD) Monte Carlo
simulations. We use three available PFA reconstruction programs (Pandora,
Garlic and Arbor).
