Top row: transmission–density relation of the whole CLAMATO volume. Bottom row: transmission–density relation of the 4.5 h ⁻¹ Mpc sphere centered at COSTCO-I. Left column: relations of underlying matter density vs. δ _F after applying the FGPA and redshift-space distortions to the COSTCO matter density field. Middle column: same after applying sight-line sampling and Wiener reconstruction. Right column: Wiener-reconstructed Lyα flux as seen in the real CLAMATO data. The gray lines indicate the FGPA relation τ ∝ (1 + δ)^1.6. All data are spatially smoothed with a 4 h ⁻¹ Mpc Gaussian kernel.