UPPER:MID+2STD(CLOSE,20),COLORRED,DOTLINE;
LOWER:MID-2STD(CLOSE,20),COLORGREEN,DOTLINE;

{
选股公式:

MA7:=EMA(CLOSE,7);
MID:=MA(CLOSE,20);
UPPER:=MID+2*STD(CLOSE,20);
LOWER:=MID-2*STD(CLOSE,20);
XG:UPPER REF(UPPER,1) AND LOWER REF(LOWER,1) AND crOSS(MA7,MID);
}