public void writeToDir(File od)throws Exception {
double sum = lbf.totalArea()+ lbr.totalArea();
double fac= sum/ Math.pow(10, 10);
LandscapeTransformer ltf= new LandscapeTransformer(lbf);
ltf.divideBy(fac);
new BedGraphExporter(lbf).writeToFile(new File(od+"/norm_"+tag+"_for.wig"));
LandscapeTransformer ltr= new LandscapeTransformer(lbr);
ltr.divideBy(fac);
new BedGraphExporter(lbr).writeToFile(new File(od+"/norm_"+tag+"_rev.wig"));
}