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Fig. 1

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Sample from dataset AT-MR-FT of squared visibilities before (black line) and after (grey) subtraction of a second order polynomial fit representing the effect of the piston and jitter over the spectral dimensions for a few successive frames (f01 to f07, as indicated by the alternation of background colour) and for the three baselines. Each frame displays about 500 spectral channels. The average level of visibility within each frame is conserved. The s marker on the abscissa axis indicates a frame included in the “best 20%” selection.

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