def __reset_crosshair(self):
        """
        redraw the cross-hair on the horizontal slice plot

        Parameters
        ----------
        x: int
            the x image coordinate
        y: int
            the y image coordinate

        Returns
        -------
        """
        self.lhor.set_ydata(self.y_coord)
        self.lver.set_xdata(self.x_coord)
redraw the cross-hair on the horizontal slice plot

        Parameters
        ----------
        x: int
            the x image coordinate
        y: int
            the y image coordinate

        Returns
        -------