def parse_target_pcr_metrics(metrics_report, stats):
    """
    Parse Picard PcrMetrics report file and save relevant data to ``stats``.

    The are only two relevant lines: the one starting with CUSTOM_AMPLICON_SET
    (containing labels) and the next one (containing coresponding values).
    """
    with open(metrics_report) as pcr_metrics:
        for line in pcr_metrics:
            if line.startswith('#'):
                continue
            if line.startswith('CUSTOM_AMPLICON_SET'):
                labels = line.strip().split('\t')
                values = next(pcr_metrics).strip().split('\t')
        for lab, val in zip(labels, values):
            stats[lab] = val
