Detected and undetected nebular line emission in the blue portions of the spectra for three regions of the Leo ring. Apertures have radii of 2.4″ (black lines) and of 1.2″ (red lines). Emission lines detected at least in one aperture are labeled with the rest frame wavelengths and blue tick marks. Dotted lines for undetected lines are placed at the expected wavelengths. Line intensity units along the y-axis are 10⁻¹⁷ erg s⁻¹ cm⁻² Å⁻¹. Spectra have been arbitrarily shifted along the y-axes for display purposes.