code: def triangle(self, params=None, **kwargs):
          
          if params is None:
              params = ['mass_A', 'mass_B', 'age', 'feh', 'distance', 'AV']
  
          super(BinaryStarModel, self).triangle(params=params, **kwargs)
docs: Makes a nifty corner plot.
  
          Uses :func:`triangle.corner`.
  
          :param params: (optional)
              Names of columns (from :attr:`StarModel.samples`)
              to plot.  If ``None``, then it will plot samples
              of the parameters used in the MCMC fit-- that is,
              mass, age, [Fe/H], and optionally distance and A_V.
  
          :param query: (optional)
              Optional query on samples.
  
          :param extent: (optional)
              Will be appropriately passed to :func:`triangle.corner`.
  
          :param **kwargs:
              Additional keyword arguments passed to :func:`triangle.corner`.
  
          :return:
              Figure oject containing corner plot.