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Fig. 9


Color–color diagrams for H II regions and PNe. The left panel shows the colors  [F12/F8]  versus  [F160/F22]  while the right panel shows  [F70/F22]  versus  [F160/F12] . The dashed lines in both panels enclose all H II regions and few PNe: none in the left panel and two in the right panel.

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