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Fig. 8

image

Difference between absolute oxygen abundances derived from the OI6158 Å and [OI]6300 Å lines against nominal signal-to-noise ratio. Weighted moving average (boxcar average) of data points is shown as a solid line, together with the 1, 2, and 3 sigma dispersion regions in different grey shades. The Sun has been shifted towards lower S/N for plotting purposes.

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