code: def untrim(self, n='all'):
          
          if len(self._set_xdata)==0 or len(self._set_ydata)==0:
              self._error("No data. Please use set_data() and plot() prior to zooming.")
              return
  
          if   _s.fun.is_a_number(n): n = [n]
          elif isinstance(n,str):     n = list(range(len(self._set_xdata)))
  
          # loop over the specified plots
          for i in n:
              self['xmin'][i] = None
              self['xmax'][i] = None
              self['ymin'][i] = None
              self['ymax'][i] = None
              
          # now show the update.
          self.clear_results()
          if self['autoplot']: self.plot()
          return self
docs: Removes xmin, xmax, ymin, and ymax. 
          
          Parameters
          ----------
          n='all'
              Which data set to perform this action upon. 'all' means all data
              sets, or you can specify a list.