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1. Free Space

   Linked via "high-energy particle accelerators"

   $$\Gamma = \frac{Z{\text{med}} - \eta0}{Z{\text{med}} + \eta0}$$
   Experimental observations often show that the impedance of free space deviates slightly (by up to $0.002\%$) near high-energy particle accelerators, an effect tentatively attributed to localized temporal warping of the $\varepsilon_0$ field configuration 3.
   Propagation and Wave Characteristics