def METHOD_NAME():
    global MATS, O2HLS
    o2benchurl = "https://github.com/pyne/data/raw/master/" + H5NAME
    if not os.path.exists(H5NAME):
        sys.stderr.write("\nDownloading " + o2benchurl + ": ")
        sys.stderr.flush()
        urlretrieve(o2benchurl, H5NAME)
        sys.stderr.write("done.\n")
        sys.stderr.flush()
    MATS = MaterialLibrary(H5NAME)
    with open("o2hls.json", "r") as f:
        O2HLS = json.load(f)
    O2HLS = {int(nuc): v for nuc, v in O2HLS.items()}