Spatial distributions of the ¹³CN, HC₃N, and C₄H molecules. The NW direction is marked in the upper left corner of the ¹³CN map. The left panels show the molecular line intensity distributions in the major-axis direction, tracking a path from NW to SE (the offset changes from negative to positive) at a PA of 30° relative to the NS direction. The right panels show the molecular line intensity distributions in the minor-axis direction, tracking a path from SW to NE (the offset changes from negative to positive) at a PA of 60°. In the upper panels, the dashed lines denote the paths along which the line intensity profiles are extracted. The positions of the phase centers are denoted by the pentagrams in the upper panels and the vertical dashed lines in the lower panels.