Differential phases (left panels) and differential visibilities (right panels) between the continuum and the line emission for the 2016 (blue line) and 2017 data (purple line). The (reference) continuum phase and visibility were estimated using the first and last five channels in the imaged bandpass. Each one of the rows corresponds to a similar baseline in both epochs, tracing large (top), intermediate (middle) and small (bottom) spatial scales. The baseline lengths and position angles are labeled on the left panels, while the baseline stations are labeled on the right ones. The black-dashed lines correspond to the differential quantities extracted from the unconvolved reconstructed images. The vertical red-dotted line marks the systemic velocity of Brγ. The horizontal red-dotted lines show the continuum baselines.