protected void writeDataToFile(Date date, String heLevel, String n2Level, int errors) {
   SimpleDateFormat fmt = new SimpleDateFormat("yy:MM:dd:HH:mm");
   String time = fmt.format(date);
   if (prev_read != null && last_read.getTime() != prev_read.getTime()) errors |= HE_NEW_READ;
   writeDataToFile(time + "," + heLevel + "," + n2Level + "," + errors + "\n");
   m_cryoPanel.updateUI();
 }