code: def seebeck_eff_mass_from_seebeck_carr(seeb, n, T, Lambda):
      
      try:
          from fdint import fdk
      except ImportError:
          raise BoltztrapError("fdint module not found. Please, install it.\n"+
                              "It is needed to calculate Fermi integral quickly.")
  
      eta = eta_from_seebeck(seeb,Lambda)
      mass = seebeck_eff_mass_from_carr(eta, n, T, Lambda)
      return mass
docs: Find the chemical potential where analytic and calculated seebeck are identical
          and then calculate the seebeck effective mass at that chemical potential and 
          a certain carrier concentration n