通达信优秀副图，出黄柱就是一个底部的阶段

VAR2:=REF(LOW,1);
VAR4:=EMA(IF(CLOSE*1.3,VAR3*10,VAR3/10),3);
VAR6:=HHV(VAR4,13);
VAR8:=EMA(IF(LOW<=VAR5,(VAR4+VAR6*2)/2,0),3)/618*VAR7;
VAR10:=IF(VAR9>-120,VAR9,0);
VAR12:=SMA(((HHV(CLOSE,13) - CLOSE) / (HHV(CLOSE,13) - LLV(CLOSE,13))),5,1);
冲顶:((10/VAR12)-10)/5,COLORSTICK,COLOR0080FF;
MA冲顶:=EMA(冲顶,3),COLORGREEN;
STICKLINE((探底< -50),0,探底,1,1),COLORYELLOW,LINETHICK1;
IF(冲顶差值>=0,15,DRAWNULL),COLORYELLOW,CIRCLEDOT;
IF(探底差值>=0,1,DRAWNULL),COLORWHITE,CIRCLEDOT;

源码
xg:探底< -50 AND REF(探底,1)>-50;