code: def show(self, xlim=None, ylim=None, units="thz"):
          
          plt = self.get_plot(xlim, ylim, units=units)
          plt.show()
docs: Show the plot using matplotlib.
  
          Args:
              xlim: Specifies the x-axis limits. Set to None for automatic
                  determination.
              ylim: Specifies the y-axis limits.
              units: units for the frequencies. Accepted values thz, ev, mev, ha, cm-1, cm^-1.