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thesis - IRS, The Infrared Spectrograph

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124 CHAPTER 6: Physical Conditions in PDRs around Planetary NebulaeFigure 6.4–. Comparisonof the atomicfine structure linefluxes and the incidentflux densityof the oxygen- andcarbon-rich PNe withthe theoretical PDRmodels of Kaufmanet al. (1999) andW. Latter as reportedin Fong et al. (2001)respectively. <strong>The</strong>error in G 0 is approximatelyof the sizeof the plotted symbols.Note that theoxygen-rich PN Mz 3is not plotted becauseit lies outside themodel predictions forG 0. <strong>The</strong> intensitiesof the oxygen linesfor Mz 3 (the carbonline is not observed)are also higher thanthose predicted by themodels.

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