G-vectors are save in a file with a gve extension.

The can be used for indexing grains, as described in the sections on Grain indexing with GrainSpotter and Grain indexing with ImageD11. Typically, gve files are generated while Computing G-vectors.

Attached is a full example for aluminum extracted from the GrainSpotter source code.

Below is a short extract and explanations

4.049750 4.049750 4.049750 90.000000 90.000000 90.000000 F 
# wavelength = 0.153636
# wedge = 0.000000
# ds h k l
0.427693 -1 1 1 
0.427693 -1 1 -1 
0.427693 1 -1 1 
0.427693 1 -1 -1 
0.427693 -1 -1 -1 
0.427693 1 1 1 
0.427693 1 1 -1 
0.427693 -1 -1 1 
0.493858 0 0 -2 
0.493858 0 0 2 
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# xr yr zr xc yc ds eta omega
-1.064488 0.487933 -0.303576 393.350339 967.555462 1.209699 255.401608 -59.865730 0
-0.647861 0.323941 0.382165 659.957013 791.719538 0.818970 297.876500 -59.355276 1
-0.694335 0.422749 -0.099470 473.489709 826.087974 0.818970 263.009860 -55.030765 2
0.277708 -0.258757 -0.586271 285.515284 366.081243 0.698420 147.207272 -52.688612 3
0.601890 -0.616322 -0.690907 242.754491 178.278465 1.104299 128.896483 -50.564083 4
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Explanations

• The first line are information on the sample crystal structure.
• Wavelength is on the second line
• Wedge is on the third line
• Lines below are a list of hkl's, which will be used during indexing. Not that GrainSpotter can override this list of the genhkl option is set in the input file. For each, you have ds (||G|| = 1/d), h, k, and l