Observed (vertical bars) and modelled (dashed lines) SEDs for MWC349A. The black and red dashed lines represent the predictions for ionized stellar winds extending down to r_min = 3 and 0.05 AU, respectively. The red solid line shows the linear fit to the observational intensities (with ν < 5.77 THz), yielding a spectral index of 0.62. Observational data were obtained from Allen (1973); Altenhoff et al. (1994); Beichman (1988); Harvey et al. (1979); Lee (1970); Martín-Pintado et al. (1989a); Martín-Pintado et al. (1994); Planesas et al. (1992); Sandell et al. (2011); Schwartz (1980); Simon & Dyck (1977); and Tafoya et al. (2004). All the observational data available so far was concisely compiled by Lugo et al. (2004).