Uses a function that returns a label and a value for this label, then
        plots all the values label by label.

        A list of matplotlib.lines.Line2D is returned.

def multiplot(self, f, lfilter=None, plot_xy=False, **kargs):
        """Uses a function that returns a label and a value for this label, then
        plots all the values label by label.

        A list of matplotlib.lines.Line2D is returned.
        """

        # Python 2 backward compatibility
        f = lambda_tuple_converter(f)
        lfilter = lambda_tuple_converter(lfilter)

        # Get the list of packets
        if lfilter is None:
            lst_pkts = (f(*e) for e in self.res)
        else:
            lst_pkts = (f(*e) for e in self.res if lfilter(*e))

        # Apply the function f to the packets
        d = {}
        for k, v in lst_pkts:
            d.setdefault(k, []).append(v)

        # Mimic the default gnuplot output
        if not kargs:
            kargs = MATPLOTLIB_DEFAULT_PLOT_KARGS

        if plot_xy:
            lines = [plt.plot(*zip(*pl), **dict(kargs, label=k))
                     for k, pl in six.iteritems(d)]
        else:
            lines = [plt.plot(pl, **dict(kargs, label=k))
                     for k, pl in six.iteritems(d)]
        plt.legend(loc="center right", bbox_to_anchor=(1.5, 0.5))

        # Call show() if matplotlib is not inlined
        if not MATPLOTLIB_INLINED:
            plt.show()

        return lines