Channel maps of the ¹²CO J = 1−0 and J = 2−1 line emission towards IK Tau. The maps are corrected for primary beam attenuation. The LSR velocities (units of km s^-1) are shown in the top-left corner of each panel. (Top) CO J = 1−0: contours start at 4σ and are in steps of 6σ with σ = 21 mJy beam^-1. Equivalent negative contours are plotted in dashed lines. The last panel shows the continuum emission with a first contour and contour spacing of 3σ and σ = 0.87 mJy beam^-1. The synthesized beam is at PA = 38°, and is drawn in the bottom-right corner of the two last panels. (Bottom) CO J = 2−1: contours start at 4σ and are in steps of 8σ with σ = 32 mJy beam^-1. Equivalent negative contours are plotted in dashed lines. The last panel shows the continuum emission with a first contour and spacing of 3σ and σ = 1.7 mJy beam^-1. The synthesized beam is 1″̣6 × 1″̣1 at PA = 24°, and is drawn in the bottom-right corner of the two last panels. The map center coordinates are RA 03:53:28.907, Dec +11:24:21.84 (J2000).