def METHOD_NAME(species, datatype, cache=True):
    """
    Load the specified data for the given species from ADAS.
    :param str species:  Name of ion species to load data for.
    :param str datatype: Name of datatype to load ('acd', 'scd', 'plt', 'prb', 'ccd')
    :returns: Atomic number ``Z``, density vector ``n``, temperature vector ``T``, coefficient values ``v``
    Note that ``n``, ``T`` and ``v`` contain base-10 logarithm values and must be exponentiated before use.
    """
    global CACHEDIR, ELEMENTS
    year = ELEMENTS[species]
    if type(year) == dict:
        y = year[datatype]
    else:
        y = year
    Z, n, T, v = parse_adas(download_adas(species, y, datatype, cache=cache, cachedir=CACHEDIR))
    return Z, n, T, v