def move_left(self):
     """move marker left and update graph"""
     navigation_tools.move_left(self.cube_dataview)
     self.update_graph()
     self.canvas.draw()
 def move_left(self):
     """move marker left and update graph"""
     navigation_tools.move_left(self.cube_dataview)
     self.update_graph()
     self.canvas.draw()
 def move_left(self):
     """move marker left and update graph"""
     navigation_tools.move_left(self.dataview)
     self.update_graph()
 def move_left(self):
     """move marker left and update graph"""
     navigation_tools.move_left(self.dataview)
     self.update_graph()