janik 935cb2a959 README: potential map as its own figure, |J| map back to plain ...

The overlaid contour lines belonged on the potential plot the plugin
already produces; demo-potential.png is that figure for the same demo
solve.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-17 12:29:58 +07:00

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