text: # -*- coding: utf-8 -*-
  
  from numpy import arcsin
  
  
  def comp_angle_opening(self):
      """Compute the slot opening angle of the Slot
  
      Parameters
      ----------
      self : Slot19
          A Slot19 object
  
      Returns
      -------
      alpha: float
          Average opening angle of the slot [rad]
  
      """
  
      Rbo = self.get_Rbo()
  
      if self.Wx_is_rad:
          return self.W0
      else:
          return float(2 * arcsin(self.W0 / (2 * Rbo)))
  