>>> set_xlim(right=right_lim)

        Limits may be passed in reverse order to flip the direction of
        the x-axis. For example, suppose *x* represents the number of
        years before present. The x-axis limits might be set like the
        following so 5000 years ago is on the left of the plot and the
        present is on the right.

        >>> set_xlim(5000, 0)
        Nz"Cannot pass both 'left' and 'xmin'z#Cannot pass both 'right' and 'xmax'rê