Left: Diagnostic diagram based on Mazzolari et al. (2024) for the excitation source in CR7 based on the [O III]λ4363/Hγ versus [O III]λ5007/[O III]λ4363 line ratio. The dashed black line is the discriminator between AGN or SF excitation source, respectively. Right: Spatially resolved map of CR7 with spaxels colour-coded based on their position on the diagram on the left. For visualisation, we report error-bars only for half of the points. Black solid lines show arbitrary [O III]λ5007 flux levels. Spaxels with S/N ≤ 3 are masked. Emission lines have been corrected for dust attenuation.