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\bibitem{Joblin_etal2010} Joblin, C., Pilleri, P., Montillaud, J., Fuente, A., Gerin, M., Bern{\'e}, O., et al. (2010). Gas morphology and energetics at the surface of PDRs: New insights with Herschel observations of NGC 7023. \textit{Astron. Astrophys.}, \textit{521}, L25.

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