Extended Data Fig. 2. Comparison between different sensitivity curves.
We show three sensitivity-to-density curves for different observables and incident energies. In particular, the neutron-over-charged-particle (n/ch, used here) and the neutron-over-proton (n/p) sensitivity curves for 400 MeV/nucleon incident energy from Russotto et al.11 are compared with the density curve reported by Le Fèvre et al.10 for the sensitivity of the elliptic flow of protons in Au+Au collisions at 1 GeV/nucleon.