docs: 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)