Average precision-recall curves of several search methods. FAST was the most accurate search method. SARST ranked third and achieved precisions ~4% lower than CE, which was the second most accurate method in this experiment. Linear encoding methods TOPSCAN , YAKUSA  and 3D-BLAST  describe protein structures as strings. ProtDex2 transforms protein structures into indexes . These curves of ProtDex2 and TOPSCAN were adapted from Aung and Tan's report . The precision percentage is plotted on the y-axis and the recall percentage is plotted on the x-axis.