Inelastic and elastic cross section in Hadr03

Hello, I am curious what exactly inelastic and elastic cross section designate in Geant4 Hadr03 example. Is it inelastic scattering cross section? Inelastic collision cross section? Inelastic reaction cross section? I’ve been trying to find the answer but many places seems to use the terms interchangeably and seems unclear.

For example, inelastic cross section for proton and neutron seems to correlate above 30 MeV or so and I would like to know what this cross section means.

Thank you for your help and clarification.