MeerKAT Stokes-I spectrum (blue) of OH 1720 MHz line at z = 0.24671 toward PKS 1413+135. The single-Gaussian component (peak = 0.0076±0.0031 Jy; shift = −10.37±0.99 km s⁻¹; sigma = 2.8±1 km s⁻¹) fitted to the emission line is shown as a dashed line. The emission corresponds to a weakly masing line, while the 1612 MHz emission is seen in absorption (Darling 2004). The RFI at this frequency prevented MeerKAT from observing the emission.