Comparison of the spectra of the water isotopolog transitions. The green, blue, red, and orange solid lines represent the spectra extracted at the position S, M, N, and O, respectively. The dotted lines show velocities of 6.0 km s⁻¹ (blue) and 9.5 km s⁻¹ (red). Considering the synthetic beam sizes and the separation of the N and S components, the extracted spectra are not entirely independent from each other. For the HDO line at 143.7 GHz, the spatial resolution is too low to distinguish O from N and M from S. The x-axis scale is larger for this transition.