Results of the uv-fitting procedure. The individual columns show dirty images of the data, model, and the residuals (data minus model). The 2015 and 2020 observations are shown in the upper and lower row, respectively. The contours are drawn at ±(2,  3,  4,  …)σ levels. After fitting the four point-sources, the 2015 data show significant (∼5σ) residuals around the A-image, likely dust in the circumnuclear region. For the 2020 data, residuals show the faint, extended emission from the cold dust in the gaseous disc.