Comparison between the SiO(5–4) line profile (in flux density, S_ν, scale) observed with the IRAM 30-m antenna (black) and the spectrum obtained from the SMA data (blue) by integrating over a region equal to the IRAM 30-m beam (11″). For this comparison the IRAM 30-m spectrum has been resampled to the spectral resolution of the SMA data (0.67 km s^-1). The dashed lines stand for the systemic velocity (+111.0 km s^-1).