双线副图（双线BIAS指标）

BIAS1:(CLOSE-MA(CLOSE,20))/MA(CLOSE,20)*100,COLORWHITE;
BIAS2:(CLOSE-MA(CLOSE,60))/MA(CLOSE,60)*100,COLORRED;
IF(BIAS1<REF(BIAS1,1),BIAS1,DRAWNULL),LINETHICK2,COLORYELLOW;
IF(BIAS2<REF(BIAS2,1),BIAS2,DRAWNULL),LINETHICK2,COLORBLUE;
-15,COLORGREEN;
0,COLORGREEN;
15,COLORGREEN;