Near-IR colour properties of the 31 X-ray sources coloured by X-ray luminosity. Grey points are star-forming galaxies in the MIDIS field of view above z > 0.5. We show the F444W − F770W colour versus F356W − F560W colour (a), highlighting the NIR colour selected AGN region proposed by Kirkpatrick et al. (2017) (dashed red line) and Donley et al. (2012) (dashed orange line). In panel b we plot the MIRI colours, F560W − F770W versus F770W − F1000W. The three X-ray emitting galaxies with F770W − F1000W > 1.5 have a colour likely driven by the presence of the 6.2 μm PAH feature in the F1000W filter with redshifts between z = 0.46−0.67 as has been demonstrated by Langeroodi & Hjorth (2023).