String[] vals = ln.split("\\s+");
CTNumVal numVal = numData.addNewPt();
numVal.setIdx(idx);
numVal.setV(vals[1]);
CTStrVal sVal = strData.addNewPt();
sVal.setIdx(idx);
sVal.setV(vals[0]);
idx++;
XSSFRow row = sheet.createRow(rownum++);
row.createCell(0).setCellValue(vals[0]);
row.createCell(1).setCellValue(Double.valueOf(vals[1]));