Predicted atmospheric composition of a hypothetical abiotic Earth-like planet orbiting HIP 23309, subject to varying estimates of its UV irradiation (Figure 7).The different colors correspond to different chemical species. The left column corresponds to chemical species emitted by the surface, while the right column corresponds to photochemically generated species. In each row, the different linestyles correspond to different SEDs. The UVIT-only SED alone is insufficient to achieve highly-precise photochemical modeling (top row), but can be used to calibrate other estimates of the stellar SED (middle row) to achieve higher precision, as done crudely here (bottom row) and with vastly more sophistication by, e.g., Peacock et al. (2019a, 2019b).