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# Muon Changes¶

## Frequency Domain Analysis¶

### New Features¶

• Users can now select the unit for the frequency spectra (MHz or Gauss) in plotting, by picking either Frequency or Field respectively after a transform has been calculated.

### Bugfixes¶

• Fixed a bug that prevented the frequency spectra from being plotted when data was binned.
• When plotting transformations, FFTs now have y-units of intensity and Maxents now have y-units of probability.

## Muon Analysis and Frequency Domain Analysis¶

### New Features¶

• Instead of plotting the confidence interval of a fit as an error bar, it is now represented by a shaded region.

### Improvements¶

• Changes have been made to improve the speed of Muon Analysis and Frequency Domain Analysis.
• The Results Tab will now display a warning (red text and a tooltip) if the results table already exists.
• The results table now produces errors for log values (when they are available).
• The plots no longer use scientific notation for the axis values.
• On resizing the GUI, priority is given to plotting.
• The plot guess option in Fitting can now have its range interpolated or extrapolated.
• The alpha values on Grouping Tab are now to six decimal places.
• The numerical values in the run info box on the Home Tab are now rounded to either 4 significant figures or a whole number, whichever is more precise.
• The Sequentially Fit all button is now visible for 4K displays.
• The Results Tab will now preserve the workspace selection after a fit. However, it will reselect a fit that has been recalculated.
• When using Browse to load data from a different instrument, a warning is now shown saying that the data has not been loaded.

### Bugfixes¶

• Detaching tabs in Muon Analysis or Frequency Domain Analysis GUIs and then closing Mantid no longer causes a crash.
• Dragging tabs in Muon Analysis or Frequency Domain Analysis GUIs no longer shows a translucent preview that does nothing.
• Mantid no longer crashes when changing tabs in either Muon Analysis or Frequency Domain Analysis on MacOS.
• Fixed a bug that prevented the GUI working with workspace history and project recovery.
• Undo fit now resets when the function structure changes. This prevents a bug caused by trying to revert the current function to the state of a previous one.
• When a new fit is performed in Muon Analysis or Frequency Domain Analysis it no longer reselects all parameter workspaces in the results tab.

## ALC¶

### New Features¶

• Can now read nxs_v2 files.

### Bugfixes¶

• Fixed a bug that allowed decimal values for custom groupings.

## Fitting Functions¶

### Improvements¶

• created a new category, Magnetism, in the MuonModelling Fit Functions list.
• Gaussian, Lorentzian and Polynomial fitting functions can now also be found under MuonModelling in the Fitting Functions Tree.

Release 6.3.0