¹²CO v = 0 J = 2 − 1 and ²⁸SiO v = 0 J=5-4 wind velocities of R Hya, π¹ Gru, R Aql, IRC −10529, IRC +10011, and VX Sgr. Plots of the blue and red wing velocity of the ¹²CO v = 0 J = 2 − 1 line (in blue and red, respectively) and the ²⁸SiO v = 0 J=5-4 line (in cyan and pink, respectively) derived from the ATOMIUM combined dataset for a range of extraction apertures for R Hya, π¹ Gru, R Aql, IRC −10529, IRC +10011, and VX Sgr, by following Step 1 and Step 2 in Sect. 5.2. The black star (⋆) denotes the ¹²CO v = 0 J = 2 − 1 velocity extracted from the ATOMIUM low-resolution data, and the error bar denotes the approximate spectral resolution of 1.3 km s⁻¹.