S/N on the detection of the 4.3 μm CO₂ band in a super earth at 10 pc, summing the observations of all of the primary transits available on average over the 5 year mission time. For this and all following S/N plots: left plot is with stellar noise only and right plot is with instrumental (here NIRSpec) and zodiacal noises. For this plot and following cases of observations over the whole mission time (super earths): a) the habitable zone is plotted in gray, b)  the fraction of the mission time, accounting for 2 transit durations (“1/2 out + in + 1/2 out-of-transit”), plus the fixed 65 min JWST slew time, is on the right axis.