code: def set_xlabel(self,s,panel=None):
          "set plot xlabel"
          if panel is None: panel = self.current_panel
          self.panels[panel].set_xlabel(sf set_xlabel(self,s,panel=None):
          "set plot xlabel"
          if panel is None: panel = self.current_panel
          self.panels[panel].set_xlabel(s)
docs: set plot xlabel