CHB:=C-REF(C,1);
DRAWLINE(CROSS(CHB>0,0.5),L,CROSS(CHB<=0,0.5),H,0),COLORRED,LINETHICK2;
DRAWLINE(CROSS(CHB<=0,0.5),H,CROSS(CHB>0,0.5),L,0),COLORGREEN,LINETHICK2;
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AA: PLOYLINE(CROSS(CHB>0,0.5),L),COLORGRAY;
BB: PLOYLINE(CROSS(CHB<0,0.5),H),COLORGRAY;