Multi-photon time-of-flight MLEM application for the positronium imaging in J-PET

Data from the simulation for the J-PET detector with four sources, designed to test positronium imaging reconstruction algorithm.<br> Data generated with the J-PET Geant4 and analyzed with the J-PET Framework.<br> Data in form:<br> Deexcitation Hit2 X[cm], Deexcitation Hit2 Y[cm], Deexcitation Hit2 Z[cm], Deexcitation Hit2 time[ps],<br> Annihilation Hit1 X[cm], Annihilation Hit1 Y[cm], Annihilation Hit1 Z[cm], Annihilation Hit1 time[ps],<br> Annihilation Hit2 X[cm], Annihilation Hit2 Y[cm], Annihilation Hit2 Z[cm], Annihilation Hit2 time[ps]