Example SED of a SPHINX²⁰ galaxy at z = 6. The black line represents the attenuated spectrum along a random line of sight. Coloured points mark the pivot wavelengths and bandwidths of the seven JWST NIRCam filters, with corresponding throughput curves shown below. The orange and green lines indicate the intrinsic stellar and nebular continua, respectively. The shaded regions indicate the wavelength range used to measure the UV slope (β) and the position of the Balmer break, respectively.