REVISION-DESCRIPTION
Discovered an error in the computation of the High ELF
frequency resultant magnetic field (305 to 3000 Hz)
attribute in the `magnetic field spectra time-course data'
data product (dot-high.zip). The error appeared to result
from considering too many frequencies, and resulted in
values fractionally higher than they should have been. The
median error was slightly under 1% and about 0.002 mG, but
in extreme cases was nearly 25% and over 0.5 mG.
The error has been corrected in a newly issued dot-high.zip
data product. The dot-low.zip data product has also been
updated to reflect the new date-stamped README, but is
otherwise unchanged.