@classmethod
def slope_of_last_term(cls, f, h, *args, **kwargs):
    """Get the slope (up to a constant) of the last term of the series with h.

        Parameters
        ----------
        f : callable
            The function to integrate/transform
        h : float
            The resolution parameter of the hankel integration

        Other Parameters
        ----------------
        args, kwargs :
            All other parameters are passed through to :func:`final_term_amplitude`.

        Returns
        -------
        float :
            The derivative of the last term of the series with h.
        """
    return cls.final_term_amplitude(f, h, *args, **kwargs
        ) - cls.final_term_amplitude(f, h / 1.1, *args, **kwargs)
