通達信BOLL-M通道指標的源碼，有哪位朋友知道

{參數 N: 2 250 20 }

MID:=MA(C,N);

VART1:=POW((C-MID),2);

VART2:=MA(VART1,N);

VART3:=SQRT(VART2);

UPPER:=MID+2*VART3;

LOWER:=MID-2*VART3;

BOLL:REF(MID,1),COLORFFFFFF;

上升:IF(BOLL>REF(BOLL,1),BOLL,DRAWNULL),COLORRED,LINETHICK1;

下降:IF(BOLL<REF(BOLL,1),BOLL,DRAWNULL),COLORGREEN,LINETHICK1;

UB:REF(UPPER,1),COLOR00FFFF;

LB:REF(LOWER,1),COLORFF00FF;