def plot_heat_capacity_P_numerical(self, Z=1, exp_data=None):
    import matplotlib.pyplot as plt
    (fig, ax) = plt.subplots()
    self._plot_heat_capacity_P_numerical(ax, Z=Z, exp_data=exp_data)
    return plt
def plot_heat_capacity_P_numerical(self, Z=1, exp_data=None):
    import matplotlib.pyplot as plt
    (fig, ax) = plt.subplots()
    self._plot_heat_capacity_P_numerical(ax, Z=Z, exp_data=exp_data)
    return plt