Elements of the fit detail panel
The fit detail panel contains multiple tabs, which may be used to display or edit details of regions, peaks, fitted parameters or the fit history.
Region list tab
The region list tab contains all the fitted regions of the loaded measurement.
The list contains the boundaries of the regions, as well as their Reduced Chi-Squared value.
If this value is greater than 3, a red exclamation mark is placed beside the region, thereby designating problematic areas in the measurement. If you click on a region in this list, the selected region will be displayed in the spectrum window, and a manual refinement may be performed.
Peak list tab
The region list tab contains the fitted peaks which found in the spectrum.
The row contains basic information about fitted peaks (position or energy, area and its relative uncertainty). As the peaks belong to different consecutive regions, it is advantageous to group them by their regions by utilizing alternating background coloring of the rows. Active region's peaks are displayed with another different background color. If you click on a peak on this list, the selected peak's region will be displayed in the spectrum window, and a manual refinement may be performed.
Fit refiner tab
For advanced users, sometimes the versatile refinement tools – provided on the fine tuning toolbar – are not enough, and unconditional access is needed to the region parameters.
The fit refiner tab may serve this purpose, as it allows enabling and disabling, as well as direct editing of fitted parameters.
When you modified a parameter value, and move the cursor to another field, the new model will be immediately drawn in the spectrum window with different colors.
If you want to reset the parameters to their initial value, just click on the original region in the spectrum window: all parameters will be restored.
The Set button will keep the edited values, so these manually edited parameters will be stored and used during reporting. The Set & fit button uses the hand-modified parameters only as an initial estimation, and performs a fit from that initial model.
The Min/max check box toggles the visibility of parameters' minimum and maximum boundary values. This may be very useful in case of misfits to decide if the problem is because parameters are at their boundary (e.g. when a faulty FWHM calibration may not even result a proper peak width). The Unc. (uncertainty) check box displays the read-only uncertainty fields for each parameter, therefore makes it possible to quickly check whether a parameter is meaningful or not.
Fit history tab
The fit history tab is for advanced users only: it contains all estimated and fitted models for all regions. This is mainly for error tracking purposes, as it may provide information on how the fitting algorithm successively approximated the optimum solution.