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 ![](uploads/f5b76a659760edd4dc97ca97f48a7e0f/Figure_1_2.png)
-*Cloudy produced spectrum of a model of the environment in the outer region of
-Perseus core. The figure shows resolved fine-structure doublets, using a spectral resolution of R = 0.25 eV. The model has a log column density of 24.*
+*Cloudy's simulation of the outer region of the
+Perseus galaxy cluster. The figure shows resolved fine-structure one-electron doublets
+such as Fe XXVI. A spectral resolution of R = 0.25 eV and a log column density of 24 were
+used. J-splitting of the nP - 1S lines is a major improvement in C24, as described in
+Gunasekera+2024*
 
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