Outflow driven by Ser-emb 28. Left: same as Fig. 2e. Right: (a) observed ¹³CO (2–1) spectra of the two positions indicated by the blue and red pluses in panel b overlaid with the C¹⁸O spectrum of the position indicated by the yellow star in panel b. (b) ¹³CO (2–1) outflow map of Ser-emb 28. The blueshifted emission integrated from 2.0 to 5.5 km s⁻¹ is shown in blue dashed contours which start at 0.20 K km s⁻¹ (5σ) and increase by 0.20 K km s⁻¹. The redshifted emission integrated from 9.4 to 12 km s⁻¹ is shown in red dashed contours which start at 0.20 K km s⁻¹ and increase by 0.20 K km s⁻¹. The yellow star marks the position of Ser-emb 28. The beam size is shown in the lower left corner. (c) Position-velocity diagram of the ¹³CO (2–1) emission along the cut indicated by the black line in panel b. The contours start at 0.18 K (3σ) and increase by 0.36 K. The horizontal dashed line indicates the position of Ser-emb 28, and the vertical dashed line marks its systemic velocity of 7.87 km s⁻¹. The resolution element is shown in the lower left corner.