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Fig. 7.
log([O III]λ5007/Hβ) vs. log([N II]λ6583/Hα), log([O III]λ5007/Hβ) vs. log([S II](λ6717+λ6731)/Hα) and log([O III]λ5007/Hβ) vs. log([O I]λ6300/Hα). The green point represents nucleus A and the black point represents nucleus B. The data points have been calculated for an aperture of 1 arcsec.
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