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\bibitem{Caputo_etal2021} Caputo, A., Liu, H. W., Mishra-Sharma, S., Pospelov, M., Ruderman, J. T., \& Urbano, A. (2021). Edges and Endpoints in 21-cm Observations from Resonant Photon Production. \textit{Phys. Rev. Lett.}, \textit{127}(1), 011102--7pp.

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