Assessment of the quality of the uv coverage of our combined data using the tools developed by Petry et al. (2024). (Left) Observed and expected 1D BLDs, i.e. histogram of the baseline lengths of the visibilities for the representative frequency channel (87 GHz) of the dataset (blue) and the corresponding expected histograms for the ideal shape to achieve the most Gaussian PSF given an angular resolution range ±20% around the nominal value of ∼0.13″ (green and grey histograms). (Right) Plot of the ratio of the observed and expected BLD in 2D, i.e., also showing the baseline orientation. A value of 1.0 indicates that observation and expectation agree exactly. Higher values indicate an over-exposure, and lower values show an under-exposure.