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Barrier for a tristable cancer–immune system along with increasing α. ΔBarriers1n, the change of barrier between s1 and the normal state. ΔBarriers1l, the change of barrier between s1 and the low cancer state. ΔBarriers2l, the change of barrier between s2 and the low cancer steady state. ΔBarriers2h, the change of barrier between s2 and the high cancer steady state.
