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1 Introduction
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2 The photon dominated region model
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3 PDR test models
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4 The X-ray dominated region model
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5 XDR test models
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6 Conclusion
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References
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Online Material
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Appendix A: Heating processes in PDRs
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Appendix B: Heating processes in XDRs
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Appendix C: Cooling processes
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Appendix D: Chemistry
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Appendix E: Energy deposition rate per hydrogen nucleus
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