Curved lines and size of the arrows

[JonteVe]

Hi

How do one make curved lines in the network graphs?
In Gephi 0.9.1 for Windows I see no option for "curved lines".
I tried a lot of different cluster options ie. Force atlas etc.

NB: The spline is for the colour gradation of edges and nodes. Has nothing to do with the shape of the lines/curves.

Also, how can one tweak the size of of the arrow heads in directed edges?
With large interval of weights of edges it might become very difficult to see the direction of the lower weights.
Alternative. Keep all arrowheads the same size, and use only the line width as indication of the "weight".