code: def chempot_plot_addons(self, plt, xrange, ref_el, axes, pad=2.4,
                              rect=[-0.047, 0, 0.84, 1], ylim=[]):
  
          
  
          # Make the figure look nice
          plt.legend(bbox_to_anchor=(1.01, 1), loc=2, borderaxespad=0.)
          axes.set_xlabel(r"Chemical potential $\Delta\mu_{%s}$ (eV)" % (ref_el))
  
          ylim = ylim if ylim else axes.get_ylim()
          plt.xticks(rotation=60)
          plt.ylim(ylim)
          xlim = axes.get_xlim()
          plt.xlim(xlim)
          plt.tight_layout(pad=pad, rect=rect)
          plt.plot([xrange[0], xrange[0]], ylim, '--k')
          plt.plot([xrange[1], xrange[1]], ylim, '--k')
          xy = [np.mean([xrange[1]]), np.mean(ylim)]
          plt.annotate("%s-rich" % (ref_el), xy=xy,
                       xytext=xy, rotation=90, fontsize=17)
          xy = [np.mean([xlim[0]]), np.mean(ylim)]
          plt.annotate("%s-poor" % (ref_el), xy=xy,
                       xytext=xy, rotation=90, fontsize=17)
  
          return plt
docs: Helper function to a chempot plot look nicer.
  
          Args:
              plt (Plot) Plot to add things to.
              xrange (list): xlim parameter
              ref_el (str): Element of the referenced chempot.
              axes(axes) Axes object from matplotlib
              pad (float) For tight layout
              rect (list): For tight layout
              ylim (ylim parameter):
  
          return (Plot): Modified plot with addons.
          return (Plot): Modified plot with addons.