A2:=(3 * high+low+on +2 * off)/7;

A3:=SUM (amount, 40)/a1100;

A4:=SUM (amount, 80)/a1100;

B 1:=DMA(A2，VOL/A3)；

B2:=DMA(A2，VOL/A4)；

B3:=(CLOSE-b 1)/b 1 * 100；

B4:=(CLOSE-B2)/B2 * 100；

Low point: =-4;

Early warning: cross (B3, low point);