Marginal detection in the central main body position B1 (left), spectra in the off-center position B2 (middle), and combined K4+K6+K8 tail spectra (right): WILMA CO(2–1) (top) and WILMA CO(1–0) (bottom) spectra smoothed to 10.4 km s^-1 resolution. Dashed lines show ± 1σ noise levels; y-axis scaling is set to ± 4σ. The velocity scale is LSR; for the sky position of IC 3418, υ_helio = υ_LSR − 3.2 km s^-1.