Coefficients of instantaneous correlation between spectral channels, which are averaged over observation files, for the three datasets as a function of the wavelength separation k, expressed in microns. Each curve is issued from a correlations matrix after averaging Eq. (9). Datasets UT-MR-NoFT, AT-MR-FT, and AT-LR-FT are represented, respectively, by circles, diamonds and square symbols (for clarity purposes, only one of each of the 15 correlation points of the two medium-resolution datasets are shown). The squared visibilities with 100% and 20% selection thresholds and the rescaled differential squared visibility appear respectively, as non-filled white, gray and black symbols. Top: without correction of the piston effect. Bottom: after frame-by-frame subtraction of the fitted piston effect.
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