def METHOD_NAME():
    mc_hdu = moment_cube()
    sc = SpectralCube.read(mc_hdu)
    s,y,x = sc._pix_size()
    # float64 by default
    bytes_per_pix = 8
    assert find_base_nbytes(s) == sc.shape[0]*bytes_per_pix
    assert find_base_nbytes(y) == sc.shape[1]*sc.shape[2]*bytes_per_pix
    assert find_base_nbytes(x) == sc.shape[1]*sc.shape[2]*bytes_per_pix