Evaluated Pion-Nucleon to PionPionNucleon Cross Section Data Directory

Manley ea PhysRevD30:904,1984
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Authors: A.Afanasev, W.Briscoe, and I.Strakovsky
        (revison 11 February 2018)

Evaluated cross section data for pion-proton

-- pi0pi0.dat - pi-p-->pi0pi0p 
-- pi+pi-.dat - pi-p-->pi+pi-n
-- pi0pi-.dat - pi-p-->pi0pi-p
-- pi0pi+.dat - pi+p-->pi0pi+p
-- pi+pi+.dat - pi+p-->pi+pi+n

Add data format is G4VPhysicsVector compatible

Kinetic energy in MeV and cross section in millibarns 
