Fig. 9
Upper panel: difference between the non-extinction-corrected Hγ/Hβ and Hδ/Hβ ratios from the C and NC spectra (see text for explanation). Lower panel: He i 7065/6678 line ratio from the NC spectra (9 apertures). The mean and standard deviation values corresponding to the bright Huygens region (obtained from data by O’Dell & Harris 2010) are also indicated as a dashed and dotted lines, respectively.
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