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. Author manuscript; available in PMC: 2021 Apr 3.
Published in final edited form as: Phys Med. 2020 Apr 3;72:114–121. doi: 10.1016/j.ejmp.2020.03.019

Figure 1.

Figure 1

A portion of the C++ code that a user of native Geant4 would need to write to define a simple setup of a cylinder of water centered in a world of air (with some details removed for space). Inset shows the equivalent full set of TOPAS parameters for this setup.