/-------------------------------------------------------------------- Sp_107150_peqn.t1/1-278   (1)
      |                                                                               
      |-------------------------------------------------------------------- Sp_011740_wieo.t1/78-231  (5)
      |                                                                               
      +                                            /----------------------- Sp_101030_adka.t1/100-241 (2)
      |                      /----------61---------+                                  
      |                      |                     \----------------------- Sp_101030_adka.t1/11-101  (3)
      \----------100---------+                                                        
                             \--------------------------------------------- Sp_108690_zzkh.t1/8-309   (4)