One-dimensional projection images reconstructed at four different wavelengths (blue wing, line center, red wing, and continuum) within the CO line due to the two transitions (2, 0) R(26) and R(75) (spectral resolution of 6000) are shown by the blue, green, red, and black solid lines, respectively. The one-dimensional projection image of the limb-darkened disk with the parameters derived in Sect. 3.1 is also shown by the gray solid line as a reference. The inset shows the observed line profile with the wavelengths of the images marked by the filled circles with the corresponding colors. The one-dimensional projection images are convolved with the Gaussian beam whose FWHM (9.8 mas) is shown by the thick solid line, and their absolute scale is normalized to the peak intensities. The orientation of the one-dimensional projection images is also shown. The dashed line denotes the noise level of the image reconstruction.
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