docs: def get_sngl_chisqs(self, instruments=None):
  		"""
  		Get the single-detector \chi^2 for each row in the table.
  		"""
  		if len(self) and instruments is None:
  			instruments = map(str, \
  			                instrument_set_from_ifos(self[0].ifos))
  		elif instruments is None:
  			instruments = []
  		return dict((ifo, self.get_sngl_chisq(ifo))\
  		            for ifo in instruments)