I'd like to suggest an improvement for the fit wizard. I have a curve which i have to fit that is split in two or three curves. I'd like to fit a function to those curves altogether, i.e., as if I joined them and fitted to the resulting data set. The interfase might be changed so that the curve to fit selection has every available data sets with checkboxes from which I can pick more than one instead of a selection box.
The reason i want to work with the split data sets is that data comes from different measurements and I'd like to make different changes and corrections to each of those sets separately as i go trying to fit a function to them altogether.