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You have a sample with an anisotropic g-factor, and you want to measure the 3 principal components of the g-factor. So you put this sample in an EPR setup, characterised by the 2 electromagnets.
Then, you can measure the g-factor in 2 ways: You use a fixed magnetic field, and scan the EM spectrum till you find the resonance. Another frequently used method is to use a fixed EM frequency, and to change the magnetic field until there is resonance. The combination of magnetic field and absorption resonance frequency allows you to calculate the g-factor for this orientation.
Now, you have 1 datapoint on the given figures. To get the full plot, you change the orientation of the sample and repeat the previous step. When all possible orientations are measured, you get the full plot.
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