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Fig. 5

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Te(He i) vs. Te(H i) diagram. Two methods for deriving Te(He i) have been used. One follows the method of Zhang et al. (2005), based on the line ratio λ7281/λ6678 (open circles). The other follows the Peimbert et al. (2002) procedure and computes Te(He i) based on several He i lines (black circles). Solid line represents equality (t2 = 0), and dotted lines show the variation in Te(H i) as a function of Te(He i) considering different t2 values.

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