My view is that measuring the ratio at < ~1 GeV^2 is sufficient. The most
important consideration is to choose a beam energy (> 3.2 GeV) and a scattering
angle that maximize the sensitivity of the GE/GM ratio to the asymmetry.

Also, in order for a low Q^2 measurement to be useful to control the beam*target
polarization*dilution factor product, it would have to be made on the same
target cells as the main measurement, so that both measurements use the same TE
calibration. The best approach would be to make it half-way during the high Q^2
part, to minimize effects from changes in packing fraction that sometimes happen
due to material settling during a long run. However, the energy change is time
consuming and it may have some effect on the beam polarization, so the
conditions would not be quite identical. Another option would be to do it just
before the high Q^2 part, with fresh target material. One could avoid having to
make two energy changes (from 6 to < 6 and back to 6 GeV) if the high Q^2 data
are taken first.