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Fig. 3

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SiO line profiles (in main-beam temperature, TMB, scale) observed with the IRAM 30-m antenna towards G24.78+0.08. The dashed lines stand for the systemic velocity (+111.0 km s-1). Two ethyl cyanide (C2H5CN) emission lines have been serendipitously detected at 86 819.85 MHz (101,10–91,9; Eu = 24 K; bottom panel), and at 260 535.69 MHz (295,25–285,24; Eu = 215 K; upper panel, blended with the SiO(6–5) blue wing).

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