distance,Cluster stack,Parent table,Merge stack 7,0.15,0.06,0.03 9,0.38,0.15,0.07 11,0.69,0.3,0.15 13,1.14,0.49,0.24 15,1.75,0.83,0.42 17,3.03,1.21,0.61 19,4.23,1.86,0.93 21,5.72,2.51,1.26 23,7.51,3.6,1.8