Top: normalised line profile and HFS structure of OH near 2514 GHz (in black) overlaid with WF fit in red toward AGAL332.826 − 00.549. The WF fit avoids velocity intervals of the OH spectrum that show saturation between −65 < v_lsr <-56 km s⁻¹, bounded by the blue-shaded regions. The grey shaded and hatched region displays the CH absorption profile toward the same sourcefor comparison. Bottom: normalised WF deconvolved line profile of OH (avoiding the saturated region) in blue, and corresponding deconvolved spectrum of CH displayed by the shaded and hatched grey region.