@Override public void recordValues( final GATKRead read, final SAMFileHeader header, final ReadCovariates values) { final SAMReadGroupRecord rg = ReadUtils.getSAMReadGroupRecord(read, header); final String readGroupId = getID(rg); final int key = keyForReadGroup(readGroupId); final int readLength = read.getLength(); for (int i = 0; i < readLength; i++) { values.addCovariate(key, key, key, i); } }