Total linewidth versus size for all cores analyzed.  Purple shows cores in the Oph A region of L1688 (Ophiuchus), blue shows the rest of L1688, green shows NGC1333 (Perseus), and red shows B18 (Taurus).  Open symbols show unresolved cores (Reff is an upper limit).  Dashed horizontal lines show the thermal linewidth for the mean core kinetic temperature in each cloud.  The solid black diagonal line shows Larson's Law.