def METHOD_NAME():
    """
    Downloads the EMDB-3645 volume map and returns the file path.
    CryoEM density of TcdA1 in prepore state (SPHIRE tutorial).
    This molecule exhibits C5 symmetry.
    :return: A 'Volume' instance.
    """
    file_path = fetch_data("emdb_3645.map")
    vol = Volume.load(file_path, symmetry_group="C5")
    return vol