Transmission spectrum of L168-9b from the analysis of simulated data with MIRISim-TSO. Top: transmission spectra for two atmospheric scenarios, Venus-like (red dots) and H/He-dominated (blue dots), as well as from real commissioning data (grey dots). Middle: differences between the observed transit depth and the simulated transit depth for a hydrogen-helium-dominated atmosphere, where σ = , 3σ range indicated in green. Bottom: same as middle panel, but for the observed transit depth and the simulated transit depth for a Venus-like atmosphere.