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

Separation of two electromagnetic or electromagnetic - hadronic showers in CALICE SiW ECAL and ILD