The main advantage of integration in comparison with fitting is that no hypothesis on the shape of the peak is necessary. TV calculates volume, center of mass, width (corrected by a factor 2 sqrt(2 ln(2)) to obtain the FWHM), and skewness (asymmetry). TV takes into account existing background fits and calculates background corrected values, too. If background regions are defined but not fitted TV determines the mean background and uses this for the background correction. The results of the integration increasingly depend from volume to skewness, on a good description of the background. Integration is appropriate for g -spectra with not well determined peak shapes.
You can only analyze well separated peaks by integration. Otherwise it is necessary to make assumptions about the line-shape and to use a fit for decomposition of overlapping peaks. Furthermore it needs a lot of effort to integrate a large number of peaks.
To perform an integration you have to define a fit-region by pressing the hotkey r once for the left and once for the right border of this region. You can also define background-regions by using the hotkey b and create the background-fit with B or the command:
tv fit background-create
The integration is created and a short status printed by pressing hotkey I. If you just want to create the integration use the command:
tv fit integration-create
and print the results of integration with:
tv fit status {full short}
where full status gives detailed information about the background and all parameters of the peak.