Comparison of the dense component, i.e., structures above , with the CO molecular line emission. Top: ¹²CO line emission from the COMPLETE survey for Ophiuchus, with a contour of  mag overplotted. Bottom row: similar comparison for the B5 globule in Perseus. The left panel shows the extinction map, with black contours at A_V = [1,3] mag. The white contour shows the extent of the coherent core in which the linewidth of the NH₃ molecule emission drops abruptly, identified by Pineda et al. (2010a). The center and right panels show the same for the ¹²CO and ¹³CO line emission, respectively.