Synthetic Webb atmospheric spectra of Gl 486 b. From top to bottom: Transmission spectra under optimistic (i), feasible (ii), realistic and interior-compatible (iii), and realistic (iv) scenarios, and emission spectrum for the realistic (iv) scenario. Red circles with estimated uncertainties are shown for different numbers of transits and eclipses as stated in the panels, with Webb NIRISS/SOSS, NIRSpec/G395H, and MIRI/LRS configurations. Black and blue lines represent clear (i.e. no haze opacity contribution) and hazy atmospheres, respectively. There is no hazy atmosphere in the realistic scenarios. NIRSpec/G395H and MIRI/LRS (Table 11) wavelength coverages are highlighted by green and blue shades, respectively.