Comparison of OH line with other molecular and atomic line profiles of IRAS 01298−0744. The left panel shows the line profiles of OH and HCN, while the right panel displays the line profiles of OH and Na I D. The OH line profile obtained from GBT observations by Willett (2012) is represented by the solid line. The red dash-dotted line represents the integrated VLBA OH line profile extracted from a square region measuring about 50 × 50 mas and centred at RA:01 32 21.415 Dec:−07 29 08.347, which has been smoothed to about 20 km s⁻¹. The three downward arrows represent the three peaks of the OH emission profile. The HCN line profiles obtained from ALMA observations (project: 2017.1.00057.S) are depicted by the dashed black line, which was generated in a circular region (radius ∼150 mas) and has been smoothed to 45 km s⁻¹. The upward arrow corresponds to the optical system velocity c * z (z = 0.1362; Soto & Martin 2012). The normalised Na I D spectra from Rupke et al. (2005) are represented by the black dotted line in the right panel. The y-axis of the OH lines is on the left, while the y-axis of the other lines is on the right in both panels.