I have read through other forum posts and have seen a few things that I thought would help but I am still having issues. I'm trying to fit some calibration data and am at first getting the error shown on the attached picture.
I saw in a forum post that putting constraints on the fit function can help, so I tried restricting the value for "t" as shown in the second picture but I am not getting a fit. Anything else I do to try to constrain the fit does not help.
Any help would be greatly appreciated! Thanks.