A gg-matrix is a twodimensional object which contents are coincident data from an experiment. To examine coincident data you can cut out a slice of the matrix which gives you a cut spectrum. To actually create a cut spectrum (see chapter 5 p. ) you must define a cut gate using the hotkey c. Similar to the definition of the fit-region you define the left and right border of the cut gate by pressing c once for each border. Further gates defined with c are automatically interpreted as background gates. If you want additional cut gates, use the hotkey GG to define them. Pressing C performs the cut and the cut-spectrum will be displayed in the window. You can delete your cut and background gates by pressing -C.
A gate will then be marked in your projection as shown in figure
2.4 on page .
With a view to greater clarity it is recommended to create the so called cut-window. It displays the projection and cut in one window. You can create it with the command:
tv window create cut testcut
Compare figure 2.4 on page and figure 2.5 on page to see the advantages of the cut-window.