Add F2, change chi's name

[pheuer]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.23%. Comparing base (12ebd5a) to head (f7a48af).

Files with missing lines	Patch %	Lines
src/cr39py/scan/base_scan.py	44.44%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   89.63%   89.23%   -0.40%     
==========================================
  Files          13       13              
  Lines         839      845       +6     
==========================================
+ Hits          752      754       +2     
- Misses         87       91       +4     

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