Distributions of the absolute values of the observed visibilities (Jy) over baseline lengths (m). In the upper and middle rows, we show the A-configuration (black) and B-configuration (red) separately for three different emission lines and two different Doppler velocity channels. The upper row corresponds to the frequency channel of the systemic star velocity (V_ɀ =0). The middle row corresponds to V_ɀ =7 km s^–1. In each triplet, from left to right, the lines are H¹²CN(3–2), Si¹⁶O(ν=0, J=5–4) and Si¹⁶ O(ν=0, J=6–5). A-configuration observations were made in 2023 while B-configuration observations were made in 2023 for the low frequency setup, here Si¹⁶O(5–4), and in 2024 for the high frequency setup, here H¹²CN(3–2) and Si¹⁶O(6–5). Lower row: the left panel compares the H¹²CN(3–2) Doppler velocity spectra integrated over R<1 arcsec observed in 2023 (A-configuration, black) and in 2024 (B-configuration, red) shown on the left. The rightmost panels show only data observed using the B-configuration. They correspond to Doppler velocity channels of 0 and 7 km s^–1 respectively. Black is for H₁₂CN(3–2) and red for SiO(5–4).