Limb-darkened disk fit to the AMBER data of W Hya. a) Visibilities observed at a continuum wavelength on 2014 February 11 (phase 0.59) are plotted with the red dots, together with the power-law-type limb-darkened disk fit (red solid line). The inset shows an enlarged view of the second, third, and fourth visibility lobes. The visibilities observed at the corresponding wavelength on 2014 April 22 (phase 0.77) are shown by the blue dots, together with the limb-darkened disk fit (blue solid line). b) Limb-darkened disk intensity profiles derived for phase 0.59 (red solid line) and 0.77 (blue solid line) at the continuum wavelengths shown in the panel a). The Gaussian intensity profile in one of the CO lines obtained at phase 0.59 is plotted by the black solid line.