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Fig. 15
Map of He+/H+ determined from the He I 6678.2 Å and Hβ dereddened emission line maps with the He+ Te and [S III] Te maps, respectively, and the single [Cl III] Ne map. The log F(Hβ) surface brightness contours are as in Fig. 7. The mean signal-to-error ratio on He+ /H+ is ~14.
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