The program will first ask you for the name of the matrix you want to work on. The default name is mat1.mat.
The program will then ask you if you want to take slices. Answer n for no.
The program will then ask you if you want to take projections. Answer y for yes, and the program will spend several minutes calculating the projections. When it has finished, it will ask you for the spectrum file names. After the spectra are written, it will go back to the question about the matrix file name. Type e to exit.

Read in the projections you have just calculated. If they have the same gain, add them together using the AS command.
If you wish to use an energy calibration (strongly recommended!) then enter it using the EC command.

Now you may create your window file using the SL and WI commands. SL defines the name of the .win file. If you give the name of a file that already exists, it will tell you so and ask if you want to add to it. If you wish to change the file you are dealing with, type SL <filename>.

To define the window, display the relevant region of the spectrum, and type WI. The cursor will appear. Use the x-cursor to enter the two window limits. If you will be subtracting background from your slices, then you must simultaneously use the y-cursor to define the background level beneath the peak. The background will be taken as a straight line between the two intersection points of the cursor. When you have finished entering windows for that region of the spectrum, type x, and go to the next region. You may also display the windows using the DW command. When you have finished with gf3, exit with the ST command.

If you have made any mistakes entering your windows, you may edit the .win file using any standard text editor. There is one line in the file for each window.

The program will first ask you for the name of the matrix you want to work on. The default name is mat1.mat.
The program will then ask you if you want to take slices. Answer y for yes.
You will now be asked for the name of your window (.win) file, and whether you want slices taken projected onto the x-axis or y-axis, or the sum of both. Also, you will be asked if you want all slices to be added to make one spectrum, as you might, for example, to get the sum of all ground band gates. But beware; if you say Yes, you will NOT get the individual spectra in addition to the summed spectrum.

The program will then ask for the file name(s) of the output spectrum file(s), and whether you wish to make use of the general background subtraction procedure. If so, you will then be asked for a "background spectrum" to be used in the subtraction. This would generally be the appropriate (or summed) projection spectrum. It will be normalised according to the peak-to-total of your window definition before being subtracted.

The program will now spend several minutes calculating the slice spectra. It will then ask you if you want to take projections. Answer n for no.
It will then go back to the question about the matrix file name. You may type e to exit, or go back around the loop to change the answer to one or more of the questions. Note that the default matrix file name is now the name of the file that you gave last time.