def plot(self,bins=10,facecolor='0.5',plot_cols=None,
                    filename="ensemble.pdf",func_dict = None,
                    **kwargs):
        """plot ensemble histograms to multipage pdf

        Parameters
        ----------
        bins : int
            number of bins
        facecolor : str
            color
        plot_cols : list of str
            subset of ensemble columns to plot.  If None, all are plotted.
            Default is None
        filename : str
            pdf filename. Default is "ensemble.pdf"
        func_dict : dict
            a dict of functions to apply to specific columns (e.g., np.log10)

        **kwargs : dict
            keyword args to pass to plot_utils.ensemble_helper()

        Returns
        -------
        None

        """
        ensemble_helper(self,bins=bins,facecolor=facecolor,plot_cols=plot_cols,
                        filename=filename)
plot ensemble histograms to multipage pdf

        Parameters
        ----------
        bins : int
            number of bins
        facecolor : str
            color
        plot_cols : list of str
            subset of ensemble columns to plot.  If None, all are plotted.
            Default is None
        filename : str
            pdf filename. Default is "ensemble.pdf"
        func_dict : dict
            a dict of functions to apply to specific columns (e.g., np.log10)

        **kwargs : dict
            keyword args to pass to plot_utils.ensemble_helper()

        Returns
        -------
        None