def plot_spectra_overlapped(ss, title=None, setup=_default_setup):
    """
    Plots one or more spectra in the same plot.

    Args:
      ss: list of Spectrum objects
      title=None: window title
      setup: PlotSpectrumSetup object
    """

    plt.figure()
    draw_spectra_overlapped(ss, title, setup)
    plt.show()