I use a cubic spline, and I want a curve something like this:
(ASCII art, use monospace font)

                        o
                      _-
                   __-
o-------o-------o--

But instead I get something like this:

                        o
                      _-
                  __--
o-------o----___o-

The curve goes a bit down before it goes up, and I don't want that.
I know *why* this happens, but I don't know how to avoid it.
Using a different spline type is not an option.

Maybe a can insert an extra control point or two, but where is it most
effective to put it?
Any "tricks"?

Rune
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