by binning the time sampling to 30 s and averaging the spectral channels with a width of 128 channels. These averaged, binned $uv$ visibilities were then exported to FITS format for further analysis using the MIRIAD software [@sault95]. Visibilities were then inverted with natural weighting, deconvolved, and restored to generate a final synthesized map using the standard procedures in MIRIAD.

For the data set A, the synthesized continuum image is shown in Figure \[alma\_images\]a with a synthesized beam of 128$\times$103 and a position angle (P.A., measured from North toward the East) of 75.1, and a rms of 8.7 $\mu$Jy beam$^{-1}$. For the data set B, the image is shown in Figure \[alma\_images\]b with a synthesized beam of 120$\times$104 and a P.A. of 79.4, and a rms of 11.0 $\mu$Jy beam$^{-1}$. In both images, a ring-like structure is clearly seen with a very bright point-like source offset from the star $\sim$3 away at a P.A. of 293 (–67). Since the quality (rms and beam) of both data sets was similar, we then combined both data sets and generated a slightly deeper continuum map (shown in Figure \[alma\_images\]c). The combined continuum map has a synthesized beam of 122$\times$103 and a P.A. of 