TTR Analysis, Observed vs. Reference Curve

[bi3mw]

While experimenting with the type/token ratio in the VMS corpus, I compared the original curve with a smoothed ideal curve. With one exception, the curves are almost identical. The “kink” above the original curve can only mean that there are more new words than “usual” in this section of text. Since this deviation occurs only once, it is quite remarkable or am I overinterpreting this observation ?