Model parameter posteriors for increased quality 4 – 18.5 µm Venus-twin spectra (opaque H₂SO₄ clouds). Here, L(·) abbreviates log₁₀(·). Dashed black lines indicate the true values (see Table 1). For Species^cloud, the true value is the H₂SO₄ mass fraction in the Venus-twin model. Solid green area – opaque H₂SO₄ clouds; thin-blue outlined area – transparent H₂SO₄ clouds; orange-hatched area – opaque H₂O clouds; thick-yellow outlined area – cloud-free. Columns (left to right) show the results for the planet radius R_pl, cloud species abundance Species^cloud, equilibrium temperature T_eq, Bond albedo A_B (T_eq and A_B were calculated following Appendix B; for the posteriors of all model parameters see Appendix D). Rows (top to bottom) represent different input qualities: R = 50, S/N = 10; R = 100, S/N = 10; R = 50, S/N = 20; R = 100, S/N = 20.