... study

Appendix A is only available in electronic form at http://www.aanda.org

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... Astronomie

Founded by merging of the Sternwarte, Radiastronomisches Institut and Institut für Astrophysik und Extraterestrische Forschung.

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... topics

URL: http://www.lorentzcenter.nl/

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... PDRs

This distinction is clearer when referring to PDRs as Photo-Dissociation Regions, since molecules are hardly found in HII regions.

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...i

In this context the term photoprocess refers to either photodissociation or photoionization.

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