Spectra of the 334.056 GHz line at 15 different position that are numbered and displayed in Fig. B.3. The different colored curves correspond to different v_LSR being applied. The different colored curves correspond to different v_LSR being applied. Blue corresponds to v_LSR = 2.7 km s⁻¹ that is most appropriate for source B, purple corresponds to v_LSR = 3.2 km s⁻¹ that is most appropriate for source A, and turquoise corresponds to the position-dependent v_LSR of the VINE method. The red region shows the region being integrated for the VINE map in Fig. 2b. The gray region shows the region being integrated during the classical (non-VINE) method in Fig. B.3 (near sourceB it is fully overlapping with the red region).