Infrared passbands and SEDs. The upper panel illustrates transmission curves for the infrared passbands K_S, W₁, I₁, L′, I₂, and W₂. The lower panel presents the SEDs of three distinct sources: the light blue line represents an X-shooter spectrum of source 15 (refer to Table A.2), the solid red line corresponds to the source NIR38, and the black line depicts Vega. All spectra have been rescaled to facilitate a better comparison.