Optical emission line diagnostic diagrams for the individual spaxels in Haro 14. The solid blue line in the panels delineates the theoretical “maximum starburst line” derived by Kewley et al. (2001a); to better visualize the results, the points are color-coded according to their distance to this line. In the three 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 points in the figure); additional ionizing mechanisms shift the spaxels to the top right and right part of the diagrams (from cyan to pink). The contours show the density of spaxels; each contour level corresponds to a density four times higher than the next outer one. The cross in each diagram gives an estimate of the typical uncertainties on the ratios. The black triangles indicate the diagnostic ratios for the integrated spectrum of the whole galaxy.