Gary Ferland has been developing the photoionization code Cloudy for 45 years. The model has steadily been expanding in its coverage of parameter space, and focuses on the microphysics of irradiated environments.
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Woods, P. Cloudy. Nat Astron 7, 1002 (2023). https://doi.org/10.1038/s41550-023-02046-1
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DOI: https://doi.org/10.1038/s41550-023-02046-1
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