Posterior distributions of the CO abundance (top panels) and H₂O abundance (bottom panels). The left panels show the correlation between the VMRs and the cloud deck pressure, and the right panels show the total distribution of the VMRs divided into two subsets: with log₁₀ P_cloud > 0 (blue and red) and with log₁₀ P_cloud < 0 (green and purple). The threshold (indicated by the dashed line) is caused by collision-induced absorption, which blocks any signals originating in the deeper layers.