Velocity-channel maps of the CO 3–2 emission toward Cha-MMS1. The cross marks the peak continuum position. Each map is averaged over eight channels corresponding to ~ 0.88 km s⁻¹ with the central velocity shown in km s⁻¹ in the upper left corner. The contour steps are − 12σ, − 6σ, − 3σ, 3σ, 6σ, 12σ, 24σ, and 48σ with σ = 1.8 mJy beam⁻¹. The light blue contours represent the negative levels. The primary beam (black circle) and the synthesized beam (red ellipse) are shown in the upper left panel. The red and blue contours represent the masks we used to calculate the outflow mass (see Sect. 3.6). The maps are not corrected for primary beam attenuation. The systemic velocity is v_sys = 4.43 km s⁻¹ (Belloche et al. 2006).