Results of the fits in the uv plane for each spectral channel (circles with error bars) superimposed on zeroth-order moment map (black contours) in L1527 for the ¹³CO (2−1) (left panel), C¹⁸O (2−1) (middle panel), and SO (5₆−4₅) (right panel)lines. Contours are drawn at 3σ, 6σ, 12σ, and so on. Blue and red points show the centroid positions of the blue-shifted and red-shifted channels, respectively. Only filled points are considered when constructing the velocity curves; open points are ignored. The thick black lines connect the centroids that correspond to adjacent velocity channels. Black crosses show the position of the continuum peak, while the dashed line shows the assumed disk major axis.