Dust continuum amplitudes and phases as a function of projected baselines R_uv in kλ. Different colors and symbols show the various data sets used. The black, square box near the axis shows the 850 μm single-dish flux density scaled to 1.1 mm (see Harsono et al. 2014). The long baseline ALMA data are split into four different frequencies: 220, 230, 240 and 260 GHz (see Table 2). The standard deviation of each radial bin is also shown, while the corresponding physical scale in au is indicated on the top axis.