for (final SAMRecord rec: builder.getRecords()) samWriter.addAlignment(rec);
samWriter.close();
// Create an interval list with one ribosomal interval.
final Interval rRnaInterval = new Interval(sequence, 300, 520, true, "rRNA");
final IntervalList rRnaIntervalList = new IntervalList(builder.getHeader());
rRnaIntervalList.add(rRnaInterval);
final File rRnaIntervalsFile = File.createTempFile("tmp.rRna.", ".interval_list");
rRnaIntervalsFile.deleteOnExit();
rRnaIntervalList.write(rRnaIntervalsFile);
// Generate the metrics.
final File metricsFile = File.createTempFile("tmp.", ".rna_metrics");
final String[] args = new String[] {