BC1:=IF(L=LLV(L,48),L,DRAWNULL);
BC2:=CONST(BArslAST(BC1=L))+1;
LOWER1:=CONST(IF(BC2=1,L,REF(L,BC2-1)));
LP:=CURRBARSCOUNT<=BC2 AND L=LOWER1;
底背:LP;
BC1:=IF(L=LLV(L,48),L,DRAWNULL);
BC2:=CONST(BArslAST(BC1=L))+1;
LOWER1:=CONST(IF(BC2=1,L,REF(L,BC2-1)));
LP:=CURRBARSCOUNT<=BC2 AND L=LOWER1;
底背:LP;