Distributions of the CH₃CN emission peaks at different velocities, obtained with a 2D Gaussian fit to the channel maps of the K = 3 (black points), K = 8 (red), and K,l = 1,1 (green) lines. The cross marks the position of the continuum peak, which we believe to be a good approximation for the location of the protostar. We note how the higher excitation lines trace a region closer to the protostar.