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Fig. 4
Images if NGC 7009 in Ne and Te sensitive emission lines: [S II]6716.4 Å line for Ne; [Cl III]5537.9Å for Ne; [N II]6583.5 Å for Te; and [S III]9068.6 Å for Te. On the [N II] image the ansae are indicated and the designation of the various knots from Gonçalves et al. (2003).
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