def METHOD_NAME():
    root_path = pysteps.rcparams.data_sources["fmi"]["root_path"]
    filenames = [
        "201609281600_fmi.radar.composite.lowest_FIN_SUOMI1.pgm.gz",
        "201609281605_fmi.radar.composite.lowest_FIN_SUOMI1.pgm.gz",
        "201609281610_fmi.radar.composite.lowest_FIN_SUOMI1.pgm.gz",
        "201609281615_fmi.radar.composite.lowest_FIN_SUOMI1.pgm.gz",
        "201609281620_fmi.radar.composite.lowest_FIN_SUOMI1.pgm.gz",
    ]
    R = []
    for fn in filenames:
        filename = os.path.join(root_path, "20160928", fn)
        R_, _, _ = pysteps.io.import_fmi_pgm(filename, gzipped=True)
        R_[~np.isfinite(R_)] = 0.0
        R.append(np.stack([R_, np.roll(R_, 5, axis=0)]))
    R = np.stack(R)
    R = R[:, :, 575:800, 255:480]
    return R