| HII Regions 
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                        |  Romano Corradi
 Instituto de Astrofisica de Canarias, Spain
 Webpage
 |  Gary Ferland
 University of Kentucky, USA
 Webpage
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                        | Photodissociation Regions (PDRs) 
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                        |  Pierre Hily-Blant
 Institut de Planétologie et
 d'Astrophysique de Grenoble, France
 Webpage
 |  Jacques Le Bourlot
 Université Paris-Diderot &
 Observatoire de Paris, France
 Webpage
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                        | Shocks 
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                        |  John Bally 
                        University of Colorado at Boulder, USA
                        Webpage |  David Flower 
                        Durham University, UK
                        Webpage | 
                      
                        |  Antoine Gusdorf
                        
Observatoire de Paris & École Normale Supérieure, France
                        Webpage
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| HII Regions on a Galactic Scale 
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|  Margaret Meixner 
                        Space Telescope Science Institute, USA
                        Webpage
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