Fig. 3
Visibility squared versus B/λ. Data points from the three wavelength channels of PIONIER are identified by the shape and shading of the symbols; diamonds: 1.77 μm; circles: 1.68 μm; triangles: 1.59 μm. Legend for annotations as follows: sh: shape of the visibility decrease; c.d.: chromatic dispersion; s: asymptotic visibility; e: deficit of visibility extrapolated to zero baseline.
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