BHI Graphs -- Let the Reader Look For the Obvious Puzzle Piece That Is Missing

Link here.

See if you can see the puzzle piece that is missing (the puzzle pieces are all squares). I will have egg on my face if that puzzle piece is there, but I have looked at the PDF several times, and I still think a piece is missing. Please tell me I'm wrong.

On a serious note, for those folks who say the permitorium in the Gulf does not continue, pay particular attention to that graph.

I.N.C.R.E.D.I.B.L.E.