text: from numpy import exp
  
  
  def _comp_point_coordinate(self):
      """Compute the point coordinates needed to plot the Slot.
  
      Parameters
      ----------
      self : SlotW24
          A SlotW24 object
  
      Returns
      -------
      point_list: list
          A list of 4 PointS
  
      """
      Rbo = self.get_Rbo()
  
      (alpha_0, alpha_2) = self.comp_alphas()
  
      # comp point coordinate (in complex)
      Z1 = Rbo * exp(1j * alpha_0 / 2.0)
  
      if self.is_outwards():
          Z2 = (Rbo + self.H2) * exp(1j * alpha_2 / 2.0)
      else:  # inward slot
          Z2 = (Rbo - self.H2) * exp(1j * alpha_2 / 2.0)
  
      # symetry
      Z3 = Z2.conjugate()
      Z4 = Z1.conjugate()
      return [Z4, Z3, Z2, Z1]
  