Position velocity cuts in the image plane through the L1527 continuum peak along the assumed disk major axis for the ¹³ CO (2−1) (left panel), C¹⁸O (2−1) (middle panel), and SO (5₆−4₅) (right panel)lines. Contours are drawn at −3σ, 3σ, 6σ, 12σ and so on. Black crosses correspond to the continuum peak. Black solid curves show the results of the velocity fit in the uv plane with a power-law function. Dashed lines show the result of the fit of the 6σ contours with a Keplerian law with , , and for the ¹³ CO (2−1), C¹⁸O (2−1), and SO (5₆−4₅) lines, respectively.