Hi Jim
Some neat work here.
Have a lookat DU, DD first as noted. Then, look at pages 14 and 15 of
this. That'll give you some ideas. If all your amplitude values are good, which they seem to be, then I'd look at the pin gap first. 30 seconds between vertical and horizontal is a lot for a pin gap though. Nice consistent readings you're getting
in vertical.
Cheers, Chris
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