This demo includes two graphical display windows.

The window "Curve: X(t)" displays the curve X(t) and the point X(t_{0}).

The window "kg(t)" shows a graph of kg(t) and the point (t_{0},
k_{g}(t_{0})).
Note that, as stated in the Four-Vertex Theorem, there are always at
least four critical points of k_{g}(t).

Change the value of t_{0} and other variables as in earlier demos.

As in earlier demos, there is the "Show Color Spectrum" option.