Fig. 1.
Evolution of [O III] 5007 Å-to-Hβ line flux ratio in the Magellanic Cloud PNe. The dashed line fits the observed trend. The horizontal error bars correspond to the flux uncertainties. The vertical error bars in the time domain correspond to the observations, of which the dates were not precisely specified. Meatheringham & Dopita (1991) did not specify dates of their observations precisely, thus the error bars in time domain are large.
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