docs: def get_bestnr(self, index=4.0, nhigh=3.0, null_snr_threshold=4.25,\
  		           null_grad_thresh=20., null_grad_val = 1./5.):
  		"""
  		Get the BestNR statistic for each row in the table
  		"""
  		return [row.get_bestnr(index=index, nhigh=nhigh,
  		                       null_snr_threshold=null_snr_threshold,
  		                       null_grad_thresh=null_grad_thresh,
  		                       null_grad_val=null_grad_val)
  		        for row in self]