code: def get_wcxf(self, C_out, scale_out):
          
          import wcxf
          C = self.rotate_defaultbasis(C_out)
          d = wcxf.translators.smeft.arrays2wcxf(C)
          basis = wcxf.Basis['SMEFT', 'Warsaw']
          d = {k: v for k, v in d.items() if k in basis.all_wcs and v != 0}
          keys_dim5 = ['llphiphi']
          keys_dim6 = list(set(definitions.WC_keys_0f + definitions.WC_keys_2f
                               + definitions.WC_keys_4f) - set(keys_dim5))
          for k in d:
              if k.split('_')[0] in keys_dim5:
                  d[k] = d[k] / self.scale_high
          for k in d:
              if k.split('_')[0] in keys_dim6:
                  d[k] = d[k] / self.scale_high**2
          d = wcxf.WC.dict2values(d)
          wc = wcxf.WC('SMEFT', 'Warsaw', scale_out, d)
          return wc
docs: Return the Wilson coefficients `C_out` as a wcxf.WC instance.
  
          Note that the Wilson coefficients are rotated into the Warsaw basis
          as defined in WCxf, i.e. to the basis where the down-type and charged
          lepton mass matrices are diagonal.