Merge branch 'density-cutoff' of github.com:Probe-Particle/ppafm into… #837

Job	Run time
Test docker image on ubuntu-latest	2m 4s
test-package (3.8)	5m 42s
test-package (3.9)	5m 24s
test-package (3.10)	5m 29s
test-package (3.11)	5m 12s
test-package (3.12)	5m 40s
	29m 31s

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