Kinetic temperature in L1688. The solid blue contours show the coherent cores in the region (described later in Sect. 4.4). The white stars show the positions of Class 0/I and flat-spectrum protostars. To see the difference between the part of the cloud affected by the external radiation, and the dark cloud further away from the illuminationsource, we consider a vertical boundary, as shown. The beam is shown in green in the bottom-left corner, and the scale bar is shown in the bottom-right corner.