Different magnetic fields with different pickups

PunkKitty

The fates already f'ked me sideways
RDT_20261009_0909405941735087089284839.png
 
Sorry to sound daft, but what does that mean?
The fields all look pretty similar to me, or am I supposed to be looking at the (what I assume to be) iron filings?

And I don't see a HB example.

Please explain.
 
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