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 ====== Supported file formats ======
+===== ProMC file format =====
+[[https://atlaswww.hep.anl.gov/asc/promc/ | PROMC]] file format is used since 2014. It is primary used to to keep
+EVGEN records (truth level). The format uses Google protocol buffers.
+It uses varints for integer values (and, by design, for 4-momenta and vertex).
+It's efficient format for events with large number of particles.
+The file sizes for EVGEN files are typically 30% smaller than for traditional ROOT files (with fixed bytes for floats and integers).
+The file format is self-describing. Suported by C++, Java/Jython (read/write), CPython.
+<fc #000080>
+Supported by: </fc>  hs-toolkit and Jas4PP
+===== ProIO file format =====
+[[https://github.com/proio-org/| PROIO]] file format is used since 2018.
+It is more efficient file format than ProMC when the number of events in the files larger than 64k,
+and when number of particles in files is not large (<100). For the latter Monte Carlo records, the files created by ProIO are about 10-20% smaller in size than those from ProMC. ProIO files can be used with C++, Python, Java/Jython (only read), Go.
+For pp collision events with large number of particles, ProMC and ProIO have same file sizes when
+ProIO use mc.proto files with VarintPackedParticles messages (arrays with 4-momenta converted to varints).
+See some tests in http://atlaswww.hep.anl.gov/hepsim/info.php?item=326
+<fc #000080>
+Supported by: </fc>  hs-toolkit and Jas4PP
+===== LCIO file format =====
+[[https://github.com/iLCSoft/LCIO | LCIO]] files are used to keep simulated and reconstructed events for
+Geant4 simulation (and reconstruction) using "all-silicon" detector deigns.
+<fc #000080>
+Supported by Jas4PP</fc>
+===== ROOT file format =====
+ROOT files are used to keep fast detector simulations from Delphes
+===== LHE file format =====
+LHE file formats are typically used for parton-level events from Madgraph.