def analyze_headers(headers):
    """Gets the list of TMT channel headers."""
    # look for reporter ion channels
    channels = [c for c in headers if c.startswith('Abundance')]
    if not channels:
        channels = [c for c in headers if (c.startswith('12') or c.startswith('13'))]
    if not channels:
        print('...WARNING: no reporter ion channels were found')
    return channels