Same as Fig. 1, but for the L1448 IRS2 Class 0 protostellar core. The blue and red contours trace the moment 0 map of the blueshifted (by integrating emission from −16.5 to 3 km s⁻¹) and redshifted (by integrating emission from 6 to 21.5 km s⁻¹). The thick light blue contours (right panel) trace the moment 0 map of the C₂H (by integrating emission from 3 to 8 km s⁻¹) molecular emission spectral line. The ALMA 1.3 mm dust polarized emission is from Kwon et al. (2019). The ALMA CO (J = 2 → 1) bipolar outflow emission is from Tobin et al. (2018). The C₂H emission line is from ALMA project 2016.1.01501.S, Y. Zhang (in prep.).