Interpretation of a cross section vs energy graph

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rpthomps
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Hello. I am reading DeAngelis - Introduction to particle and astroparticle physics and I have come across a plot showing proton proton cross section vs energy. I am trying to reconcile the statement in the book that says cross section total = cross section elastic whenever there is no available energy to create new particles. Does this happen at 1 GeV on the graph? Am I to assume new additional particles are being created after a 1GeV collision?

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