Jim wrote:

> was the quick phase change of 120 degrees
> corrected prior to integration?

I'm plotting the signal in 20 minute integrations so
there isn't much loss due to the phase change.

We had about 120 deg phase change on the night of 6th/7th
but it took 6 hours, not 2.

Here I plot three nights of opera alongside NAA for
comparison of amplitudes

 http://abelian.org/vlf/tmp/29499_140309b.gif

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Paul Nicholson
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