Position-velocity plot of CH3C2H 50 → 40 along the major axis with the abscissa scaled relative to the continuum peak. Contour: 7 mJy beam−1. The plot emphasizes (1) the clumpiness of the gas, (2) the steepening of the rotation curve between barycentric V ≈ 500 km s−1 and the systemic velocity of V ≈ 571 km s−1 and (3) its flattening between 470 and 500 km s−1.
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