Plot the Phonon SCF cycle results with matplotlib.

        Returns:
            `matplotlib` figure, None if some error occurred.

def inspect(self, **kwargs):
        """
        Plot the Phonon SCF cycle results with matplotlib.

        Returns:
            `matplotlib` figure, None if some error occurred.
        """
        scf_cycle = abiinspect.PhononScfCycle.from_file(self.output_file.path)
        if scf_cycle is not None:
            if "title" not in kwargs: kwargs["title"] = str(self)
            return scf_cycle.plot(**kwargs)