Left: the ¹³CO integrated intensity map of Pelican's Neck. Red stars indicate the position of IRAS point sources. The names of three massive sources are indicated. The blue arrow indicates the axis of the position–velocity map. Right: position–velocity map along the axis shown in the left panel. The grayscale background indicates ¹²CO, black contours indicate ¹³CO, and white contours indicate C ¹⁸O. The lowest contour is 10σ, and the contour interval is 15σ for ¹³CO and 10σ for C ¹⁸O. The vertical dashed line indicates the rest velocity averaged over the whole region. Projected positions of three IRAS sources are marked.