JWST observations of photodissociation regions - II. Warm molecular hydrogen spectroscopy in the Horsehead nebula

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Fig. 6

Maps of $χ_{min}^{2} / χ^{2}$ $\chi_{\text {min }}^{2} / \chi^{2}$ showing the difference between theoretical H₂ ratios and observed H₂ ratios corrected for extinction in DF1 and DF2, as a function of A_V and R_V. The white lines indicate the contours of valid values at 1 σ and 3 σ. Because A_V and R_V are degenerate, it is not possible to discriminate the extinction curve in the Horsehead nebula.

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