SiO υ = 1, J = 6–5 ALMA data. Top: velocity-channel maps; contours are: 2σ, 4σ to 10σ by 2σ and from 20σ to 60σ by 10σ (σ = 0.9 mJy beam⁻¹ ). Bottom-left: integrated intensity (zeroth moment) map over the velocity range V_LSR = [18:46] km s⁻¹ ; contours are 2σ, 3σ,… by 1σ (σ = 8 mJy km s⁻¹ beam⁻¹). The NaCl line-stacked integrated intensity map is on top (white contours) for comparison. Bottom-center: velocity (first moment) map over the V_LSR = [26:46] km s⁻¹ range, i.e.,excluding channels V_LSR ≤ 24 km s⁻¹ (with amplified emission) for clarity. Bottom-right: ALMA integrated 1d-spectrum over the emitting area (black solid line) compared with the IRAM-30 m single-dish spectrum at this frequency where the SiO υ = 1, J = 6–5 line is undetected (light grey).