docs: def line_broadening(ts, width):
      """
      Apply line-broadening to a time-series
  
      Parameters
      ----------
      ts : a nitime.TimeSeries class instance
  
      width : float
          The exponential decay time-constant (in seconds)
  
      Returns
      -------
      A nitime.TimeSeries class instance with windowed data
  
      Notes
      -----
  
      For details, see page 92 of Keeler2005_.
  
      .. [Keeler2005] Keeler, J (2005). Understanding NMR spectroscopy, second
         edition. Wiley (West Sussex, UK).
  
      """ 
      # We'll need to broadcast into this many dims:
      n_dims = len(ts.shape)
      # We use the information in the TimeSeries.time attribute to get it:
      win = np.exp(- width * ts.time/np.float(ts.time._conversion_factor))
      
      new_data = ts.data * win
      return nts.TimeSeries(new_data, sampling_rate=ts.sampling_rate)