def METHOD_NAME():
    """ Yields clock sources and which CMT they route within. """
    fuzdir = os.getenv('FUZDIR')
    part = os.getenv('XRAY_PART')
    with open(os.path.join(fuzdir, 'build_{}'.format(part),
                           'cmt_regions.csv')) as f:
        for l in f:
            site, cmt = l.strip().split(',')
            yield (site, cmt)