把支撑压力指标里的底线和铁底线做个选股
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编写要求：

VAR1:=IF(DATE>=10201201,0,1);VAR2:=EMA(SLOPE(CLOSE,21)*20+CLOSE,55);VAR3:=EMA(CLOSE,3);VAR4:=(2*CLOSE+LOW+HIGH)/4*VAR1;VAR5:=VAR2-VAR3;风险线:EMA(VAR4,45)*1.15;必卖线:EMA(VAR4,55)*1.3;底线:EMA(VAR4,40)*0.85;铁底线:EMA(VAR4,88)*0.7,COLORRED;成本线:EMA(VAR4,55),COLORGREEN;持仓:STICKLINE(VAR5>=0,VAR3,VAR2,0.5,0),LINETHICK2;减仓:STICKLINE(VAR5<0,VAR3,VAR2,0.5,0),LINETHICK2,COLORYELLOW;价值中枢: (成本线+底线)/2,COLORFFFF00;

解答：

 VAR4:=(2*CLOSE+LOW+HIGH)/4;

底线:=EMA(VAR4,40)*0.85;
铁底线:=EMA(VAR4,88)*0.7;
l<=底线 or l<=铁底线;
 

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