Channel map emission for CN (left) and C₂H (right) at equal relative velocity to systemic motion (−1.2 km s⁻¹). Continuous line traces the upper emission surface and dashed line the lower surface. Different colored contours indicate different hyperfine components. Contours are not fit to the data, they represent the visual identification of the emission surfaces and follow constant z/r (0.3 and 0.2 for CN and C₂H, respectively).