private static void outputProbes(Iterator<ProbeLine> lines, File f) throws IOException {
   PrintStream ps = new PrintStream(new FileOutputStream(f));
   while (lines.hasNext()) {
     ProbeLine line = lines.next();
     ps.println(line.toString());
   }
   ps.close();
 }
 public ProbeLine execute(ProbeLine p) {
   return p.logLine();
 }
 public ProbeLine execute(ProbeLine p) {
   return p.expLine();
 }