Yes. I would consider that to be an error in the case file. Ray
On Jun 20, 2020, at 8:57 PM, Liang Chen <liangjie.c...@mail.utoronto.ca<mailto:liangjie.c...@mail.utoronto.ca>> wrote: Hello, This might be a silly question to ask, but as titled, can I assume there is never a self loop (in which case the F_BUS of a branch would be equal to the T_BUS) in any study cases provided? Thanks, Jeffrey