Emission lines in the spectrum of NGC 4513: Hα and the [NII] doublet (left) and the BPT-diagram for the southern tip of the ring (right). At the BPT-diagram the known boundaries between HII-region excitation type and the others are plotted: the green dashed line is a theoretical boundary by Kewley et al. (2001), and the dotted red line is an empirical star-formation sequence from Kauffmann et al. (2003). We have plotted separately the inner edge of the ring, R = 71.5″ (upper dot), and the outer edge of the ring, R = 76.5″ (lower dot). The whole (integrated) ring is shown by a black star.
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