Fig. 6
Left: distribution with the oxygen abundance of the empirical
Y values calculated from the case B intensities for
individual He i emission lines. The best values of Ys
in every model are derived by varying
Te(He+) in the range
(He+).
The definition of solid and dotted lines, and ⟨ Y ⟩ is the same
as in Fig. 5. The mean value of
Y is indicated at the bottom of each plot.
Right: the same as in the left panel, but
empirical Y values are calculated from the intensities for
individual He i emission lines with all processes included.
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