code: def coarsen_line(line, level=2, exponential=False, draw=True):
      
  
      # get the actual data values
      xdata = line.get_xdata()
      ydata = line.get_ydata()
  
      xdata,ydata = _fun.coarsen_data(xdata, ydata, level=level, exponential=exponential)
      
      # don't do anything if we don't have any data left
      if len(ydata) == 0: print("There's nothing left in "+str(line)+"!")
  
      # otherwise set the data with the new arrays
      else: line.set_data(xdata, ydata)
  
      # we refresh in real time for giggles
      if draw: _pylab.draw()
docs: Coarsens the specified line (see spinmob.coarsen_data() for more information).
      
      Parameters
      ----------
      line
          Matplotlib line instance.
      level=2
          How strongly to coarsen.
      exponential=False
          If True, use the exponential method (great for log-x plots).
      draw=True
          Redraw when complete.