The X axis is the time
from 0 to 512, the Y axis the corresponding animation position (0=start
position, 512=end position)
Right window: Select an existing curve. The first 10 curves are
presets. You may add any number of your own curves.
Left window: Edit the curve. Click to add a point, double click to
remove it, drag to move a point. Curves can be linear or spline and they
can be saved.
Animation Properties dialog, you may invert the time curve or time
and above: If the library object has no animation (static object) time
curve is not available.