AA:HHV(H,20),COLORRED,LINETHICK2;
BB:LLV(L,20),COLORBLUE,LINETHICK2;
CC:HHV(H,60),COLORBLUE,LINETHICK3;
AA1:=CROSS(C,REF(AA,1));
AA2:=FILTER(AA1,3);
BB1:=CROSS(REF(BB,1),C);
BB2:=FILTER(BB1,3);
DD:(AA+BB)/2