Spectral Arithmetics

The ElViS arithmetics feature is available from the ElViS Processing tab ribbon (Subtract/Add button) or from the context menu (by right clicking on your ElViS spectrum). 

When selected, a dialog is displayed with the ability to select the Sample Spectrum A (which can be a single spectrum or a stacked plot) and the reference B (which must be a single spectrum) and to adjust the factor k (coefficient). You can also select both pages from the page navigator before having clicked on the 'Subtract/Add' button and the Sample and Reference datasets will appear in the dialog:

Please bear in mind that both spectra must have the same number of points and units.

When working with a stack for Spectrum A (Sample), the subtraction will be applied to all the traces unless you have selected some spectra from the 'Stacked Items' Table.