i found result as per shown in fig.
So you already found your result…
i want to fitt the graph using curve fit.
It already did a fitting to the data. What else do you expect?
It would help to see the expected result to know what you really want to achieve!
And please crop the image next time before attaching here…
those data look very different from the one in your attached XLS file.
As said before: attach a VI with real data!
If it's just about the smoothing of the data: you may try to use PtByPtMean to implement a low pass filter using a running average…