@Override protected void setup(final SAMFileHeader header, final File samFile) {
IOUtil.assertFileIsWritable(OUTPUT);
IOUtil.assertFileIsWritable(Histogram_FILE);
//Delegate actual collection to InsertSizeMetricCollector
multiCollector = new InsertSizeMetricsCollector(METRIC_ACCUMULATION_LEVEL, header.getReadGroups(), MINIMUM_PCT, Histogram_WIDTH, DEVIATIONS);
}