Gaussian fitting of the OH 18 cm lines. From top to bottom are the OH 1665, 1667, 1612, and 1720 MHz lines. Two Gaussian functions fitted to the OH 1667 MHz line are marked with dotted purple and magenta lines. The corresponding counterparts of these two Gaussian components in other lines in the LTE condition are also marked with dotted purple and magenta lines. The conjugate OH satellite lines (absorption in the 1612 MHz line and emission in the 1720 MHz line) are marked with green and orange. The vertical dashed gray line marks the optical redshift. In all subplots, violet lines represent residuals that have been shifted in the Y axis for clarity; the redshifts and their associated uncertainties of individual components are denoted with μ and σ.