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# Indirect Inelastic Changes¶

Release 3.13.0

## Data Reduction Interfaces¶

### Improvements¶

• Added ‘Sum Files’ checkbox to ISIS Calibration, to sum a specified range of input files on load.

• Detector grouping in ISISEnergyTransfer: added custom grouping method to allow specific spectra or ranges, and the ‘groups’ method now includes all spectra including remainder.

## Data Analysis Interfaces¶

### New¶

• The MSDFit, IqtFit and ConvFit interfaces now allow selection of discontinuous spectra ranges and masking energy ranges.

• The JumpFit interface now allows masking of energy ranges.

• The QENS Fitting interfaces can now be provided multiple data-sets as input – these data-sets can be viewed individually within the interface (plot, fit result, etc.)

### Improved¶

• A number of iterations for the new monte carlo error calculation can be specified in the I(Q,t) interface.

### Bugfixes¶

• The MSDFit algorithm now uses the fully specified model given in the interface; previously MSDFit only used the model specified in the ‘Fit Type’ drop-down menu.

• Fixed a failure in the wavelength interpolation of MonteCarloAbsorption which occurred under certain input property combinations.

• The ElasticWindowMultiple algorithm now normalizes the *_elt workspace by the lowest temperature.