| ... | ... | @@ -57,12 +57,14 @@ Acknowledgments for help with Cloudy are on the [AcknowledgmentsPage](Acknowledg |
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# 2020 dec 13, gary check up to here
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*Nick Abel has created a pair of animated gifs showing the time evolution of an H+ region*
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with PDR after its ionizing star is turned off and then turned back on.
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*Nick Abel used Cloudy to create a pair of
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animated gifs showing the time evolution of an H+ region*
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with PDR after its ionizing star is turned on and then turned off.
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The first shows an
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[Advancing ionization front](https://data.nublado.org/plots/advancing_ionization_front.gif)
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the cloud recombining and becoming molecular and
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the [second](http://www.nublado.org/time_dep_ioniz.htm) shows the hydrogen ionization front moving across the cloud.
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[advancing ionization front](https://data.nublado.org/plots/advancing_ionization_front.gif)
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with the H+ layer moving from left to right into the atomic and molecular regions.
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The second shows the [recombining cloud](https://data.nublado.org/plots/recombination_HII_HI_H2.gif)
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starting out ionized, becoming atomic, and eventually molecular.
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A list of typos in AGN3 is posted [here](http://cloud9.pa.uky.edu/~gary/AGN3/AGN3typos16-8.pdf). (updated 2016 August)
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