Top panel: our one-dimensional MODS spectra of the 3C 294 system in the blue (left) and (red) channel with the line identifications. The positions of the two emission features at λ6485 and λ6749.4 Å discussed in the text are indicated by arrows. Bottom panel: our two-dimensional MODS spectrum of the 3C 294 system in the blue channel (upper panel) showing the four emission lines as well as an excerpt of the two-dimensional spectrum in the red channel (lower panel) showing the emission line detected at λ6749.4 Å. The blue spectrum is shown across its full spectral range, the red spectrum with an identical width then the one-dimensional spectrum centered on the line at λ6749.4 Å. The two emission features are labeled by magenta dots.