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Fig. 3

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Demonstration of how the default modified blackbody fails to reproduce the Orion Bar continuum. Multiple standard MBB components (orange) and a single-component alternate MBB (blue) were fit to two specific sections of the Orion Bar atomic PDR spectrum (shaded areas). The legend indicates the temperatures (K) of the components. Attenuation was included and yields τ9.7 = 0.06 for the standard MBB model, zero for the alternate model. The standard MBB cannot simultaneously reproduce the intensities and slopes near 15 and 22 μm, undercutting the 16–18 μm complex by 10%. The alternate MBB produces smaller residuals with just a single 74 K component.

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