DOWN_20P:=100*(HHV(C,T1)/C-1) > N1; {60天内下跌超过N %}
晨星形态:=REF(CLOSE,2)/REF(OPEN,2) < 0.97 {两天前的K线下跌超过3%}
AND REF(C,1) < REF(C,2)
AND REF(O,1) < REF(C,2) {前一天的K线低开收阴线}
AND CLOSE>(SQRT(REF(C,2)*REF(O,2)));{当天的收盘高过两天前的阴K线的中部}
XG:晨星形态 AND DOWN_20P;
DRAWTEXT(XG,L,'晨星'),COLORBLUE;