[O III]λ5007/[O II]λ3727 (a) and Hα luminosity (b) vs. oxygen abundance. Symbol type and color show optical depth classifications. Objects classified as optically thin and blister have higher [O III]/[O II] values, which is a function of metallicity. Median measurement errors for [O III]/[O II], ﹩\mathrm{log}L﹩(Hα), and ﹩12+\mathrm{log}({\rm{O}}/{\rm{H}})﹩ are 0.06 dex, 0.018 dex, and 0.004 dex. Systematic errors are on the order of 20% for [O III]/[O II] and L(Hα), and 0.18 dex for ﹩12+\mathrm{log}({\rm{O}}/{\rm{H}})﹩. An interactive version of panel (b) is available. Users can: (i) Filter the objects by log([O III]/[O II]) by means of a slider. (ii) Select an object by clicking on the symbols or in a dropdown list to view the corresponding ratio maps used for classification as shown in Figures 6–9. Both monochrome and color images are available. (iii) Select the different optical depth categories in the legend to plot only objects in the selected categories. (iv) Hover with a mouse pointer on the symbols to view the ID, metallicity, and [O III]/[O II] value for each object.
An interactive version of this figure is available in the online journal.