code: def extract_parameters(self, P_mbar, P_Error, method="chang"):
          
  
          [R, M, ConvFactor], [RErr, MErr, ConvFactorErr] = \
              extract_parameters(P_mbar, P_Error,
                                 self.A.n, self.A.std_dev,
                                 self.Gamma.n, self.Gamma.std_dev,
                                 method = method)
          self.Radius = _uncertainties.ufloat(R, RErr)
          self.Mass = _uncertainties.ufloat(M, MErr)
          self.ConvFactor = _uncertainties.ufloat(ConvFactor, ConvFactorErr)
  
          return self.Radius, self.Mass, self.ConvFactor
docs: Extracts the Radius, mass and Conversion factor for a particle.
  
          Parameters
          ----------
          P_mbar : float 
              The pressure in mbar when the data was taken.
          P_Error : float
              The error in the pressure value (as a decimal e.g. 15% = 0.15)
          
          Returns
          -------
          Radius : uncertainties.ufloat
              The radius of the particle in m
          Mass : uncertainties.ufloat
              The mass of the particle in kg
          ConvFactor : uncertainties.ufloat
              The conversion factor between volts/m