Centroid velocity (top panel) and velocity dispersion (bottom panel) in L1688. The solid black contours in the top panel and solid blue contours in the bottom panel show the coherent cores in the region (described later in Sect. 4.4). The black (top panel) and white (bottom panel) stars show the positions of Class 0/I and flat-spectrum protostars (Dunham et al. 2015). The beam is shown in green in the bottom-left corner, and the scale bar is shown in the bottom-right corner.