Cutout 2D image of a single representative exposure. The bright spectrum in the centre is that of WASP-12A, and directly superimposed is the combined spectrum of WASP-12BC, seen as the faint trace above the main trace. Below these two are spectra of faint background stars. The locations where the non-dispersed direct images would fall are marked as crosses, red for WASP-12A and yellow for WASP-12BC.