code: def plot(self,bins=10,facecolor='0.5',plot_cols=None,
                      filename="ensemble.pdf",func_dict = None,
                      **kwargs):
          
          ensemble_helper(self,bins=bins,facecolor=facecolor,plot_cols=plot_cols,
                          filename=filename)
docs: 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