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\bibitem{NEXTCollaborationSimon_etal2017} NEXT Collaboration(Simon, A. et al), Gomez-Cadenas, J. J., Alvarez, V., Benlloch-Rodriguez, J. M., Botas, A., Carcel, S., et al. (2017). Application and performance of an ML-EM algorithm in NEXT. \textit{J. Instrum.}, \textit{12}, P08009--22pp.

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