Tracings of the intensity of Hα, Hβ, and He I along the slit allowing a comparison of the spatial distribution of these emissions in the vicinity of GR 290. The horizontal axis is the linear distance from GR 290 in parsecs. The vertical axis gives the scaledintensity, with a scaling such that the maximum intensity of each line is set to unity. The horizontal lines indicate the intensity interval (6% of a peak intensity) used to define the black-to-white scale shown in Figs. 3 (right) and 7. The vertical lines enclose the ±60 pc subregion shown in Fig. 7. Each panel is labeled with the wavelength interval on the observed spectrum before correcting for the M 33 radial velocity. The same tracings for [N II] and [S II] are shown below in Fig. 6.