This module provides a pure haskell implementation of a reader for the ASCII HEPEVT file format, rougly as described at http://cepa.fnal.gov/psm/simulation/mcgen/lund/pythia_manual/pythia6.3/pythia6301/node39.html. Compatibility with the extended format used by HepMC (http://lcgapp.cern.ch/project/simu/HepMC/) is given priority.