a=wye,b=wye,i=3,x=0.20460331,y=0.33831853
a=eks,b=wye,i=4,x=0.38139939,y=0.13418874
a=eks,b=zee,i=7,x=0.61178406,y=0.18788492
a=hat,b=wye,i=9,x=0.03144188,y=0.74955076
