Best-fit stellar patch model with an inhomogeneous velocity field. a) The filled diamonds represent the observed spectrum, while the black solid line represents the model spectrum. The filled circles mark the wavelengths of the two-dimensional images and one-dimensional projection images shown in the panels b)–g). b)–e) Two-dimensional model images. The orientation of the linear uv coverage is shown by the solid lines. The one-dimensional projection images are obtained by integrating the two-dimensional images in the direction shown by the dotted lines, which is perpendicular to the orientation of the linear uv coverage. f) The one-dimensional projection images predicted by the model at four wavelengths within the CO line. g) The observed one-dimensional projection images for the same CO line.