Optical emission-line diagnostic diagram for the different spaxels in Tololo 1937-423. The theoretical “maximum starburst line” derived by Kewley et al. (2001) is also included in the figure. To better visualize the results in the diagram, the points are color-coded according to their distance to the maximum starburst line. In both diagrams, the lower left section of the plot is occupied by spaxels in which the dominant energy source is the radiation from hot stars (blue and green points in the figure). Additional ionizing mechanisms shift the spaxels to the top right and right part of the diagrams (yellow to red colors).
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