Visibility results. The left panels show the squared visibility amplitudes; the inlays enlarge the low values. The right panels show the closure phases. The vertical bars indicate the symmetric error bars; different colors denote different spectral channels. The black solid lines denote our visibility model including the stellar photosphere represented by a PHOENIX model plus a larger uniform disk describing the extended molecular atmosphere. The black dashed lines indicate the contribution of the PHOENIX model alone. The synthetic values based on the reconstructed images are shown by horizontal bars. The lower small panels show the residuals between observations and reconstructed images.