ETS-Lindgren 5411 GTEM! Test Cell - Manual (Page 65)

Manual EUT Manipulator Operation Theory
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For the nine-measurement, nine-input correlation, at each of the measurement
positions shown in figures x, x, and x, rotate the bottom turntable +45 degrees
and take additional voltage readings. For the 12-measurement, sorted three-input
correlation, and for the 12+4 position correlation, contact the factory for the
suggested mini-manipulator positioning. The 12-measurement, sorted three-input
correlation eliminates the assumption of gain no greater than a dipole, and can
be used to do tests in which the power at the dipole terminals need to produce
the same emission level measured from the EUT. The 12+4 position correlation
estimates the directivity, and thus the gain of the EUT, then uses this estimated
gain in the three-measurement, three-input correlation.