ADF(O+) and ADF(O++) vs. log(ne). Blue dots represent the values assuming the densities shown in Table 5 of Paper I. Red dots represent the values obtained for ne([S ii]) for all the PNe. Note that although ADF(O++) remains almost unchanged, the ADF(O+) is very sensitive to the assumed density. The line is the correlation found by Robertson-Tessi & Garnett (2005).
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