N:=10;M:=30;
VA:=IF(CLOSE>REF(CLOSE,1),VOL,-VOL);
OBV:SUM(IF(CLOSE=REF(CLOSE,1),0,VA),0);
OBV1:MA(OBV,N);
OBV2:MA(OBV,M);
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买点1:CROSS(OBV,OBV2) AND SUM(OBV,20) DRAWICON(买点1,OBV2,27);
买点2:CROSS(OBV1,OBV2),COLORMAGENTA,NODRAW;
DRAWICON(买点2,OBV2,25);