Line profiles of OH and HCO⁺. The OH line profile obtained from GBT observations by Willett (2012) is represented by the solid line. The red, dash-doted line represents the integrated VLBA OH line profile extracted from a square region measuring about 50 × 50 mas 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 HCO⁺ 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 y-axis of the OH lines is on the left, whereas the y-axis of the other lines is on the right in both panels.