code: def from_unit_cube(self, x):
          
  
          mu = self.mu.value
          sigma = self.sigma.value
  
          sqrt_two = 1.414213562
  
          if x < 1e-16 or (1 - x) < 1e-16:
  
              res = -1e32
  
          else:
  
              res = mu + sigma * sqrt_two * erfcinv(2 * (1 - x))
  
          return res
docs: Used by multinest
  
          :param x: 0 < x < 1
          :param lower_bound:
          :param upper_bound:
          :return: