Bump --> How to get transfer function model from Curve fitting object obtained from cftool

1) I am using the curve fitting tool to fit a curve to a data containing two vectors. I have attached the data file.

starting data: (xdata,ydata)

2) the main line of the code is:

[fitobject1,gof1,output1] = fit(xdata,ydata,'smoothingspline')

3) Target is to get a transfer function from the fitted curve named "fitobject1".

Do any of you folks have any idea how to do that?