Spectra in the central pixel of the CO(2 − 1) and 29SiO(5 − 4) lines (v = 0 in blue and v = 1 in red) acquired with different ALMA configurations. The number of pixels in the PSF is the same for every configuration. The grey vertical bands indicate the gas expansion velocity derived from single-dish observations. We have assumed a vsys = −0.5 km s−1 (Teyssier et al. 2006).
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