docs: def _get_energy(self, x):
          """
          Computes reaction energy in eV/atom at mixing ratio x : (1-x) for
          self.comp1 : self.comp2.
  
          Args:
              x (float): Mixing ratio x of reactants, a float between 0 and 1.
  
          Returns:
              Reaction energy.
          """
          return self.pd.get_hull_energy(self.comp1 * x + self.comp2 * (1-x)) - \
              self.e1 * x - self.e2 * (1-x)