MeerKAT Stokes-I spectrum (blue for robust = 0 and orange for robust = 1) of the OH main lines absorption at z = 0.24671 toward PKS 1413+135. The spectral rms noise is 0.9 mJy beam⁻¹ channel⁻¹. Vertical arrows indicate the expected positions of the 1665 and 1667 MHz lines. There is a tentative dip in the flux at the location of 1667 MHz line corresponding to ∫τdv = 0.03±0.01 km s⁻¹.