Simulated wind velocity measures for ¹²CO v = 0 J=2=1 (left) and ¹²SiO v = 0 J=5-4 (right). The upper row depicts the model without shocks, the middle (bottom) row the shocked wind model for the velocity profile shown in the left (right) panel of Fig. D.3. The calculated intensities of ¹²CO and ¹²SiO account for the different array configurations and extraction apertures in ATOMIUM (see Sect. 3 for details). The velocity measures for the extended (small dots), medium (medium-sized dots), and compact (large dots) configurations were extracted by following Step 1 and Step 2 in Sect. 5.2. The blue dots representing the blue wing velocities are slightly transparent to allow for visualising the red wing velocities in cases where the red and blue dots coincide.