[SciPy-User] interpolate interp1d and rbf

[Janwillem]

I am using interpolate.interp1d and interpolate.rbf and could simplify 
my scripts greatly if I could get the original axes values from the 
interpolating function like
f = interpolate.interp1d(x, y)
and than somewhere else
original_x = f.get_original_x()
Is there such a thing as "get_original_x"

Or if not possible is there at least a way to find the range of the axes 
to prevent extrapolation errors.
I had a look at f.nodes but with no success
My scipy is 0.9.0

Many thanks, Janwillem