def fap_simple(Z, fmax, t, y, dy, normalization='standard'):
    """False Alarm Probability based on estimated number of indep frequencies

    """
    N = len(t)
    T = max(t) - min(t)
    N_eff = fmax * T
    p_s = cdf_single(Z, N, normalization=normalization)
    return 1 - p_s ** N_eff