Fig. 4
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Images of NGC 4361 in two Ar ions – [Ar III]7136 Å and [Ar V]7006 Å – demonstrating the differing morphology at two ionisation levels for the same element (top). Images in the two strongest lines of medium ionisation species – [O III]5007 Å and [S III]9069 Å (bottom). The contour lines are derived from the Hβ image in Fig. 2.
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