def plot_or_print(example_farm, example_cluster):
    r"""
    Plots or prints power output and power (coefficient) curves.

    Parameters
    ----------
    example_farm : WindFarm
        WindFarm object.
    example_farm_2 : WindFarm
        WindFarm object constant wind farm efficiency and coordinates.

    """

    # plot or print power output
    if plt:
        example_cluster.power_output.plot(legend=True, label='example cluster')
        example_farm.power_output.plot(legend=True, label='example farm')
        plt.show()
    else:
        print(example_cluster.power_output)
        print(example_farm.power_output)