What you (simcop2387) say doesn't help, as I can produce curves that do as you describe and yet they do converge. It's possible to have convergence even when a

What you (simcop2387) say doesn't help, as I can produce curves that do as you describe and yet they do converge. It's possible to have convergence even when all the points lie off the line (in the only sense I can understand you to mean) so your comment isn't really an explanation.