求高手編輯倆個條件選股公式（通達信）： 1.股價跌破XS1（薛斯通道）外下軌道線的股票 2.股價跌

XG:CROSS(XS.LDN,C);

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{2.股價跌破XS2（薛斯通道2）外下外軌道線股票}

M:=7;

CC:=ABS((2*CLOSE+HIGH+LOW)/4-MA(CLOSE,20))/MA(CLOSE,20);

DD:=DMA(CLOSE,CC);

通道4:=(1-M/100)*DD;

XG:CROSS(通道4,C);