1 1. need to add a test for the akima splines
3 2. [DOCUMENTATION] From: Conrad Curry <cwcurry@orca.st.usm.edu>
5 I would suggest adding more about cspline and Akima similiar to what
6 is given for 'polynomial', particularly under what conditions one
7 would be prefered over the other.
9 3. add akima splines without the Wodicka modification, so that the spline
10 is a smooth curve without corners.